45447920 has 40 divisors (see below), whose sum is σ = 120763104. Its totient is φ = 15581952.

The previous prime is 45447917. The next prime is 45447949. The reversal of 45447920 is 2974454.

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

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 40019 + ... + 41138.

Almost surely, 2^45447920 is an apocalyptic number.

45447920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

45447920 is an abundant number, since it is smaller than the sum of its proper divisors (75315184).

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

45447920 is a wasteful number, since it uses less digits than its factorization.

45447920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81177 (or 81171 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 45447920 is about 6741.5072498663. The cubic root of 45447920 is about 356.8655871574.

The spelling of 45447920 in words is "forty-five million, four hundred forty-seven thousand, nine hundred twenty".