247976640 has 196 divisors, whose sum is σ = 886169424. Its totient is φ = 66064896.

The previous prime is 247976621. The next prime is 247976681. The reversal of 247976640 is 46679742.

247976640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×247976640² = 122984827971379200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 232749 + ... + 233811.

Almost surely, 2^247976640 is an apocalyptic number.

247976640 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 247976640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (443084712).

247976640 is an abundant number, since it is smaller than the sum of its proper divisors (638192784).

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

247976640 is an equidigital number, since it uses as much as digits as its factorization.

247976640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The square root of 247976640 is about 15747.2740498157. The cubic root of 247976640 is about 628.2564033395.

The spelling of 247976640 in words is "two hundred forty-seven million, nine hundred seventy-six thousand, six hundred forty".