61998732 has 18 divisors (see below), whose sum is σ = 156719108. Its totient is φ = 20666232.

The previous prime is 61998721. The next prime is 61998799. The reversal of 61998732 is 23789916.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 861058 + ... + 861129.

Almost surely, 2^61998732 is an apocalyptic number.

It is an amenable number.

61998732 is an abundant number, since it is smaller than the sum of its proper divisors (94720376).

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

61998732 is a wasteful number, since it uses less digits than its factorization.

61998732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722197 (or 1722192 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 61998732 is about 7873.9273555196. The cubic root of 61998732 is about 395.7864627741.

The spelling of 61998732 in words is "sixty-one million, nine hundred ninety-eight thousand, seven hundred thirty-two".