61531344 has 60 divisors (see below), whose sum is σ = 196805856. Its totient is φ = 17580096.

The previous prime is 61531297. The next prime is 61531391. The reversal of 61531344 is 44313516.

61531344 is a `hidden beast` number, since 615 + 3 + 1 + 3 + 44 = 666.

61531344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61531297) and next prime (61531391).

It is a super-2 number, since 2×61531344² = 7572212588892672, which contains 22 as substring.

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 29514 + ... + 31529.

Almost surely, 2^61531344 is an apocalyptic number.

It is an amenable number.

61531344 is an abundant number, since it is smaller than the sum of its proper divisors (135274512).

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

61531344 is a wasteful number, since it uses less digits than its factorization.

61531344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61064 (or 61055 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 61531344 is about 7844.1917365653. The cubic root of 61531344 is about 394.7893851292.

The spelling of 61531344 in words is "sixty-one million, five hundred thirty-one thousand, three hundred forty-four".