61993904 has 20 divisors (see below), whose sum is σ = 137272464. Its totient is φ = 26568768.

The previous prime is 61993889. The next prime is 61993913. The reversal of 61993904 is 40939916.

It is a super-2 number, since 2×61993904² = 7686488266322432, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 276647 + ... + 276870.

Almost surely, 2^61993904 is an apocalyptic number.

It is an amenable number.

61993904 is an abundant number, since it is smaller than the sum of its proper divisors (75278560).

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

61993904 is a wasteful number, since it uses less digits than its factorization.

61993904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553532 (or 553526 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 61993904 is about 7873.6207681092. The cubic root of 61993904 is about 395.7761888723.

The spelling of 61993904 in words is "sixty-one million, nine hundred ninety-three thousand, nine hundred four".