45191820 has 24 divisors (see below), whose sum is σ = 126537264. Its totient is φ = 12051136.

The previous prime is 45191801. The next prime is 45191821. The reversal of 45191820 is 2819154.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (45191821) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 376539 + ... + 376658.

It is an arithmetic number, because the mean of its divisors is an integer number (5272386).

Almost surely, 2^45191820 is an apocalyptic number.

It is an amenable number.

45191820 is an abundant number, since it is smaller than the sum of its proper divisors (81345444).

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

45191820 is a wasteful number, since it uses less digits than its factorization.

45191820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753209 (or 753207 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 45191820 is about 6722.4861472524. The cubic root of 45191820 is about 356.1940090521.

The spelling of 45191820 in words is "forty-five million, one hundred ninety-one thousand, eight hundred twenty".