45139280 has 40 divisors (see below), whose sum is σ = 105241032. Its totient is φ = 18005504.

The previous prime is 45139273. The next prime is 45139309. The reversal of 45139280 is 8293154.

It can be written as a sum of positive squares in 4 ways, for example, as 3717184 + 41422096 = 1928^2 + 6436^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 44054 + ... + 45066.

Almost surely, 2^45139280 is an apocalyptic number.

45139280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

45139280 is an abundant number, since it is smaller than the sum of its proper divisors (60101752).

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

45139280 is a wasteful number, since it uses less digits than its factorization.

45139280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583 (or 1577 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 45139280 is about 6718.5772303368. The cubic root of 45139280 is about 356.0559184981.

The spelling of 45139280 in words is "forty-five million, one hundred thirty-nine thousand, two hundred eighty".