247902740 has 96 divisors (see below), whose sum is σ = 566286336. Its totient is φ = 90921600.

The previous prime is 247902737. The next prime is 247902749. The reversal of 247902740 is 47209742.

It is a happy number.

It is a super-2 number, since 2×247902740² = 122911536999015200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247902740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247902749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1641665 + ... + 1641815.

It is an arithmetic number, because the mean of its divisors is an integer number (5898816).

Almost surely, 2^247902740 is an apocalyptic number.

247902740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247902740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283143168).

247902740 is an abundant number, since it is smaller than the sum of its proper divisors (318383596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247902740 is a wasteful number, since it uses less digits than its factorization.

247902740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 247902740 is about 15744.9274371145. The cubic root of 247902740 is about 628.1939878353.

The spelling of 247902740 in words is "two hundred forty-seven million, nine hundred two thousand, seven hundred forty".