45605721 has 12 divisors (see below), whose sum is σ = 70735632. Its totient is φ = 26060328.

The previous prime is 45605701. The next prime is 45605737. The reversal of 45605721 is 12750654.

It is not a de Polignac number, because 45605721 - 2⁶ = 45605657 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (45605701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154975 + ... + 155268.

It is an arithmetic number, because the mean of its divisors is an integer number (5894636).

Almost surely, 2^45605721 is an apocalyptic number.

It is an amenable number.

45605721 is a deficient number, since it is larger than the sum of its proper divisors (25129911).

45605721 is a wasteful number, since it uses less digits than its factorization.

45605721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310260 (or 310253 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 45605721 is about 6753.2007966593. The cubic root of 45605721 is about 357.2781377264.

The spelling of 45605721 in words is "forty-five million, six hundred five thousand, seven hundred twenty-one".