61913620 has 12 divisors (see below), whose sum is σ = 130018644. Its totient is φ = 24765440.

The previous prime is 61913557. The next prime is 61913639. The reversal of 61913620 is 2631916.

It can be written as a sum of positive squares in 2 ways, for example, as 48385936 + 13527684 = 6956^2 + 3678^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1547821 + ... + 1547860.

It is an arithmetic number, because the mean of its divisors is an integer number (10834887).

Almost surely, 2^61913620 is an apocalyptic number.

It is an amenable number.

61913620 is an abundant number, since it is smaller than the sum of its proper divisors (68105024).

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

61913620 is a wasteful number, since it uses less digits than its factorization.

61913620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3095690 (or 3095688 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 61913620 is about 7868.5208266866. The cubic root of 61913620 is about 395.6052676490.

The spelling of 61913620 in words is "sixty-one million, nine hundred thirteen thousand, six hundred twenty".