45772721 has 4 divisors (see below), whose sum is σ = 48465252. Its totient is φ = 43080192.

The previous prime is 45772717. The next prime is 45772733. The reversal of 45772721 is 12727754.

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 34810000 + 10962721 = 5900^2 + 3311^2 .

It is a cyclic number.

It is not a de Polignac number, because 45772721 - 2² = 45772717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45772751) 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, 1346240 + ... + 1346273.

It is an arithmetic number, because the mean of its divisors is an integer number (12116313).

Almost surely, 2^45772721 is an apocalyptic number.

It is an amenable number.

45772721 is a deficient number, since it is larger than the sum of its proper divisors (2692531).

45772721 is a wasteful number, since it uses less digits than its factorization.

45772721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692530.

The product of its digits is 27440, while the sum is 35.

The square root of 45772721 is about 6765.5540054012. The cubic root of 45772721 is about 357.7137027346.

The spelling of 45772721 in words is "forty-five million, seven hundred seventy-two thousand, seven hundred twenty-one".