61731396 has 30 divisors (see below), whose sum is σ = 161378910. Its totient is φ = 20577024.

The previous prime is 61731377. The next prime is 61731409. The reversal of 61731396 is 69313716.

61731396 is a `hidden beast` number, since 617 + 3 + 1 + 39 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46049796 + 15681600 = 6786^2 + 3960^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 61731396.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 94941 + ... + 95588.

It is an arithmetic number, because the mean of its divisors is an integer number (5379297).

Almost surely, 2^61731396 is an apocalyptic number.

It is an amenable number.

61731396 is an abundant number, since it is smaller than the sum of its proper divisors (99647514).

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

61731396 is a wasteful number, since it uses less digits than its factorization.

61731396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190545 (or 190534 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 61731396 is about 7856.9329894050. The cubic root of 61731396 is about 395.2167714721.

It can be divided in two parts, 6173 and 1396, that added together give a square (7569 = 87²).

The spelling of 61731396 in words is "sixty-one million, seven hundred thirty-one thousand, three hundred ninety-six".