61531944 has 32 divisors (see below), whose sum is σ = 154533120. Its totient is φ = 20416896.

The previous prime is 61531933. The next prime is 61531961. The reversal of 61531944 is 44913516.

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, 397 + ... + 11100.

It is an arithmetic number, because the mean of its divisors is an integer number (4829160).

Almost surely, 2^61531944 is an apocalyptic number.

It is an amenable number.

61531944 is an abundant number, since it is smaller than the sum of its proper divisors (93001176).

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

61531944 is a wasteful number, since it uses less digits than its factorization.

61531944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11729 (or 11725 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 61531944 is about 7844.2299813302. The cubic root of 61531944 is about 394.7906683390.

The spelling of 61531944 in words is "sixty-one million, five hundred thirty-one thousand, nine hundred forty-four".