61688004 has 24 divisors (see below), whose sum is σ = 164501568. Its totient is φ = 17625120.

The previous prime is 61687999. The next prime is 61688021. The reversal of 61688004 is 40088616.

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, 367107 + ... + 367274.

It is an arithmetic number, because the mean of its divisors is an integer number (6854232).

Almost surely, 2^61688004 is an apocalyptic number.

It is an amenable number.

61688004 is an abundant number, since it is smaller than the sum of its proper divisors (102813564).

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

61688004 is a wasteful number, since it uses less digits than its factorization.

61688004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734395 (or 734393 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 61688004 is about 7854.1711211305. The cubic root of 61688004 is about 395.1241483393.

The spelling of 61688004 in words is "sixty-one million, six hundred eighty-eight thousand, four".