61697904 has 40 divisors (see below), whose sum is σ = 159668352. Its totient is φ = 20529600.

The previous prime is 61697903. The next prime is 61697929. The reversal of 61697904 is 40979616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61697903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49837 + ... + 51059.

Almost surely, 2^61697904 is an apocalyptic number.

It is an amenable number.

61697904 is an abundant number, since it is smaller than the sum of its proper divisors (97970448).

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

61697904 is a wasteful number, since it uses less digits than its factorization.

61697904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285 (or 2279 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 61697904 is about 7854.8013342159. The cubic root of 61697904 is about 395.1452843764.

The spelling of 61697904 in words is "sixty-one million, six hundred ninety-seven thousand, nine hundred four".