45991988 has 18 divisors (see below), whose sum is σ = 93626946. Its totient is φ = 19710768.

The previous prime is 45991963. The next prime is 45991993. The reversal of 45991988 is 88919954.

45991988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 23600164 + 22391824 = 4858^2 + 4732^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117131 + ... + 117522.

It is an arithmetic number, because the mean of its divisors is an integer number (5201497).

Almost surely, 2^45991988 is an apocalyptic number.

It is an amenable number.

45991988 is an abundant number, since it is smaller than the sum of its proper divisors (47634958).

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

45991988 is a wasteful number, since it uses less digits than its factorization.

45991988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234671 (or 234662 counting only the distinct ones).

The product of its digits is 933120, while the sum is 53.

The square root of 45991988 is about 6781.7393049276. The cubic root of 45991988 is about 358.2839834448.

The spelling of 45991988 in words is "forty-five million, nine hundred ninety-one thousand, nine hundred eighty-eight".