45721637 has 8 divisors (see below), whose sum is σ = 50074080. Its totient is φ = 41488560.

The previous prime is 45721583. The next prime is 45721639. The reversal of 45721637 is 73612754.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 45721637 - 2¹² = 45717541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 45721597 and 45721606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45721639) 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, 29039 + ... + 30572.

It is an arithmetic number, because the mean of its divisors is an integer number (6259260).

Almost surely, 2^45721637 is an apocalyptic number.

It is an amenable number.

45721637 is a deficient number, since it is larger than the sum of its proper divisors (4352443).

45721637 is a wasteful number, since it uses less digits than its factorization.

45721637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59683.

The product of its digits is 35280, while the sum is 35.

The square root of 45721637 is about 6761.7776508844. Note that the first 3 decimals coincide. The cubic root of 45721637 is about 357.5805794205.

The spelling of 45721637 in words is "forty-five million, seven hundred twenty-one thousand, six hundred thirty-seven".