45178890 has 32 divisors (see below), whose sum is σ = 109489536. Its totient is φ = 11929920.

The previous prime is 45178883. The next prime is 45178907. The reversal of 45178890 is 9887154.

It is a super-2 number, since 2×45178890² = 4082264203264200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4221 + ... + 10400.

It is an arithmetic number, because the mean of its divisors is an integer number (3421548).

Almost surely, 2^45178890 is an apocalyptic number.

45178890 is an abundant number, since it is smaller than the sum of its proper divisors (64310646).

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

45178890 is a wasteful number, since it uses less digits than its factorization.

45178890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14734.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 45178890 is about 6721.5243806744. The cubic root of 45178890 is about 356.1600351468.

The spelling of 45178890 in words is "forty-five million, one hundred seventy-eight thousand, eight hundred ninety".