261728402 has 16 divisors (see below), whose sum is σ = 426675480. Its totient is φ = 119688192.

The previous prime is 261728371. The next prime is 261728419. The reversal of 261728402 is 204827162.

261728402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 218418841 + 43309561 = 14779^2 + 6581^2 .

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, 43343 + ... + 49010.

Almost surely, 2^261728402 is an apocalyptic number.

261728402 is a deficient number, since it is larger than the sum of its proper divisors (164947078).

261728402 is a wasteful number, since it uses less digits than its factorization.

261728402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92477.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 261728402 is about 16178.0221906140. The cubic root of 261728402 is about 639.6616065913.

The spelling of 261728402 in words is "two hundred sixty-one million, seven hundred twenty-eight thousand, four hundred two".