61191904 has 24 divisors (see below), whose sum is σ = 122273928. Its totient is φ = 30138240.

The previous prime is 61191901. The next prime is 61191917. The reversal of 61191904 is 40919116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61191901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12127 + ... + 16414.

It is an arithmetic number, because the mean of its divisors is an integer number (5094747).

Almost surely, 2^61191904 is an apocalyptic number.

It is an amenable number.

61191904 is a deficient number, since it is larger than the sum of its proper divisors (61082024).

61191904 is a wasteful number, since it uses less digits than its factorization.

61191904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28618 (or 28610 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 61191904 is about 7822.5254234167. The cubic root of 61191904 is about 394.0620892127.

The spelling of 61191904 in words is "sixty-one million, one hundred ninety-one thousand, nine hundred four".