61689980 has 24 divisors (see below), whose sum is σ = 141326640. Its totient is φ = 22432640.

The previous prime is 61689937. The next prime is 61689997. The reversal of 61689980 is 8998616.

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, 139985 + ... + 140424.

It is an arithmetic number, because the mean of its divisors is an integer number (5888610).

Almost surely, 2^61689980 is an apocalyptic number.

It is an amenable number.

61689980 is an abundant number, since it is smaller than the sum of its proper divisors (79636660).

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

61689980 is a wasteful number, since it uses less digits than its factorization.

61689980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280429 (or 280427 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 61689980 is about 7854.2969131552. The cubic root of 61689980 is about 395.1283671875.

The spelling of 61689980 in words is "sixty-one million, six hundred eighty-nine thousand, nine hundred eighty".