61404636 has 12 divisors (see below), whose sum is σ = 143277512. Its totient is φ = 20468208.

The previous prime is 61404617. The next prime is 61404643. The reversal of 61404636 is 63640416.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 2558515 + ... + 2558538.

Almost surely, 2^61404636 is an apocalyptic number.

It is an amenable number.

61404636 is an abundant number, since it is smaller than the sum of its proper divisors (81872876).

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

61404636 is a wasteful number, since it uses less digits than its factorization.

61404636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5117060 (or 5117058 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 61404636 is about 7836.1110252472. Note that the first 3 decimals coincide. The cubic root of 61404636 is about 394.5182097901.

The spelling of 61404636 in words is "sixty-one million, four hundred four thousand, six hundred thirty-six".