61913980 has 24 divisors (see below), whose sum is σ = 133044912. Its totient is φ = 24189312.

The previous prime is 61913947. The next prime is 61914019. The reversal of 61913980 is 8931916.

It is a congruent number.

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, 35137 + ... + 36856.

It is an arithmetic number, because the mean of its divisors is an integer number (5543538).

Almost surely, 2^61913980 is an apocalyptic number.

It is an amenable number.

61913980 is an abundant number, since it is smaller than the sum of its proper divisors (71130932).

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

61913980 is a wasteful number, since it uses less digits than its factorization.

61913980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72045 (or 72043 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 61913980 is about 7868.5437026174. The cubic root of 61913980 is about 395.6060344033.

The spelling of 61913980 in words is "sixty-one million, nine hundred thirteen thousand, nine hundred eighty".