45721540 has 24 divisors (see below), whose sum is σ = 96633432. Its totient is φ = 18170880.

The previous prime is 45721523. The next prime is 45721541. The reversal of 45721540 is 4512754.

It can be written as a sum of positive squares in 4 ways, for example, as 8340544 + 37380996 = 2888^2 + 6114^2 .

It is a junction number, because it is equal to n+sod(n) for n = 45721499 and 45721508.

It is not an unprimeable number, because it can be changed into a prime (45721541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4141 + ... + 10420.

It is an arithmetic number, because the mean of its divisors is an integer number (4026393).

Almost surely, 2^45721540 is an apocalyptic number.

It is an amenable number.

45721540 is an abundant number, since it is smaller than the sum of its proper divisors (50911892).

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

45721540 is a wasteful number, since it uses less digits than its factorization.

45721540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14727 (or 14725 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 45721540 is about 6761.7704782106. The cubic root of 45721540 is about 357.5803265472.

The spelling of 45721540 in words is "forty-five million, seven hundred twenty-one thousand, five hundred forty".