45717721 has 8 divisors (see below), whose sum is σ = 54520704. Its totient is φ = 37482720.

The previous prime is 45717697. The next prime is 45717739. The reversal of 45717721 is 12771754.

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 45717721 - 2⁵ = 45717689 is a prime.

It is a super-2 number, since 2×45717721² = 4180220026867682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (45717421) 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, 141820 + ... + 142141.

It is an arithmetic number, because the mean of its divisors is an integer number (6815088).

Almost surely, 2^45717721 is an apocalyptic number.

It is an amenable number.

45717721 is a deficient number, since it is larger than the sum of its proper divisors (8802983).

45717721 is a wasteful number, since it uses less digits than its factorization.

45717721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283991.

The product of its digits is 13720, while the sum is 34.

The square root of 45717721 is about 6761.4880758602. The cubic root of 45717721 is about 357.5703703552.

The spelling of 45717721 in words is "forty-five million, seven hundred seventeen thousand, seven hundred twenty-one".