61539872 has 24 divisors (see below), whose sum is σ = 121347072. Its totient is φ = 30721600.

The previous prime is 61539853. The next prime is 61539883. The reversal of 61539872 is 27893516.

Its product of digits (90720) is a multiple of the sum of its prime divisors (3024).

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, 28097 + ... + 30207.

It is an arithmetic number, because the mean of its divisors is an integer number (5056128).

Almost surely, 2^61539872 is an apocalyptic number.

It is an amenable number.

61539872 is a deficient number, since it is larger than the sum of its proper divisors (59807200).

61539872 is a wasteful number, since it uses less digits than its factorization.

61539872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032 (or 3024 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 61539872 is about 7844.7353046486. The cubic root of 61539872 is about 394.8076230339.

The spelling of 61539872 in words is "sixty-one million, five hundred thirty-nine thousand, eight hundred seventy-two".