61631860 has 24 divisors (see below), whose sum is σ = 130765320. Its totient is φ = 24397824.

The previous prime is 61631849. The next prime is 61631863. The reversal of 61631860 is 6813616.

It can be written as a sum of positive squares in 4 ways, for example, as 1817104 + 59814756 = 1348^2 + 7734^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61631863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13945 + ... + 17824.

It is an arithmetic number, because the mean of its divisors is an integer number (5448555).

Almost surely, 2^61631860 is an apocalyptic number.

It is an amenable number.

61631860 is an abundant number, since it is smaller than the sum of its proper divisors (69133460).

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

61631860 is a wasteful number, since it uses less digits than its factorization.

61631860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31875 (or 31873 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 61631860 is about 7850.5961557069. The cubic root of 61631860 is about 395.0042407279.

The spelling of 61631860 in words is "sixty-one million, six hundred thirty-one thousand, eight hundred sixty".