61591072 has 12 divisors (see below), whose sum is σ = 121257486. Its totient is φ = 30795520.

The previous prime is 61591069. The next prime is 61591109. The reversal of 61591072 is 27019516.

61591072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 59043856 + 2547216 = 7684^2 + 1596^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 962329 + ... + 962392.

Almost surely, 2^61591072 is an apocalyptic number.

It is an amenable number.

61591072 is a deficient number, since it is larger than the sum of its proper divisors (59666414).

61591072 is a wasteful number, since it uses less digits than its factorization.

61591072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924731 (or 1924723 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 61591072 is about 7847.9979612638. The cubic root of 61591072 is about 394.9170834877.

The spelling of 61591072 in words is "sixty-one million, five hundred ninety-one thousand, seventy-two".