260640388 has 6 divisors (see below), whose sum is σ = 456120686. Its totient is φ = 130320192.

The previous prime is 260640377. The next prime is 260640389. The reversal of 260640388 is 883046062.

It can be written as a sum of positive squares in only one way, i.e., 212226624 + 48413764 = 14568^2 + 6958^2 .

It is not an unprimeable number, because it can be changed into a prime (260640389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32580045 + ... + 32580052.

Almost surely, 2^260640388 is an apocalyptic number.

It is an amenable number.

260640388 is a deficient number, since it is larger than the sum of its proper divisors (195480298).

260640388 is a wasteful number, since it uses less digits than its factorization.

260640388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65160101 (or 65160099 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 260640388 is about 16144.3608730727. The cubic root of 260640388 is about 638.7740104051.

The spelling of 260640388 in words is "two hundred sixty million, six hundred forty thousand, three hundred eighty-eight".