261477904 has 20 divisors (see below), whose sum is σ = 510262480. Its totient is φ = 129797280.

The previous prime is 261477899. The next prime is 261477947. The reversal of 261477904 is 409774162.

261477904 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-4 number, since 4×261477904⁴ (a number of 35 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56562 + ... + 61009.

It is an arithmetic number, because the mean of its divisors is an integer number (25513124).

Almost surely, 2^261477904 is an apocalyptic number.

It is an amenable number.

261477904 is a deficient number, since it is larger than the sum of its proper divisors (248784576).

261477904 is a wasteful number, since it uses less digits than its factorization.

261477904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117718 (or 117712 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 261477904 is about 16170.2784144244. The cubic root of 261477904 is about 639.4574699129.

The spelling of 261477904 in words is "two hundred sixty-one million, four hundred seventy-seven thousand, nine hundred four".