247690640 has 40 divisors (see below), whose sum is σ = 580439040. Its totient is φ = 98292096.

The previous prime is 247690609. The next prime is 247690687. The reversal of 247690640 is 46096742.

247690640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×247690640² = 122701306287219200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 247690594 and 247690603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2030 + ... + 22349.

It is an arithmetic number, because the mean of its divisors is an integer number (14510976).

Almost surely, 2^247690640 is an apocalyptic number.

247690640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

247690640 is an abundant number, since it is smaller than the sum of its proper divisors (332748400).

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

247690640 is a wasteful number, since it uses less digits than its factorization.

247690640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24519 (or 24513 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 247690640 is about 15738.1904931920. The cubic root of 247690640 is about 628.0147805087.

The spelling of 247690640 in words is "two hundred forty-seven million, six hundred ninety thousand, six hundred forty".