247280640 has 176 divisors, whose sum is σ = 838320192. Its totient is φ = 61997056.

The previous prime is 247280639. The next prime is 247280653. The reversal of 247280640 is 46082742.

It is a super-2 number, since 2×247280640² = 122295429837619200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260647 + ... + 261593.

Almost surely, 2^247280640 is an apocalyptic number.

247280640 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 247280640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419160096).

247280640 is an abundant number, since it is smaller than the sum of its proper divisors (591039552).

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

247280640 is a wasteful number, since it uses less digits than its factorization.

247280640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 247280640 is about 15725.1594586510. The cubic root of 247280640 is about 627.6680734736.

The spelling of 247280640 in words is "two hundred forty-seven million, two hundred eighty thousand, six hundred forty".