45624721 has 4 divisors (see below), whose sum is σ = 45662500. Its totient is φ = 45586944.

The previous prime is 45624713. The next prime is 45624727. The reversal of 45624721 is 12742654.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27040000 + 18584721 = 5200^2 + 4311^2 .

It is a cyclic number.

It is not a de Polignac number, because 45624721 - 2³ = 45624713 is a prime.

It is a super-3 number, since 3×45624721³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45624727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17016 + ... + 19513.

It is an arithmetic number, because the mean of its divisors is an integer number (11415625).

Almost surely, 2^45624721 is an apocalyptic number.

It is an amenable number.

45624721 is a deficient number, since it is larger than the sum of its proper divisors (37779).

45624721 is a wasteful number, since it uses less digits than its factorization.

45624721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37778.

The product of its digits is 13440, while the sum is 31.

The square root of 45624721 is about 6754.6073905150. The cubic root of 45624721 is about 357.3277465766.

The spelling of 45624721 in words is "forty-five million, six hundred twenty-four thousand, seven hundred twenty-one".