72757457 has 4 divisors (see below), whose sum is σ = 74305536. Its totient is φ = 71209380.

The previous prime is 72757427. The next prime is 72757459. The reversal of 72757457 is 75475727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72757457 - 2¹⁰ = 72756433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72757459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773969 + ... + 774062.

It is an arithmetic number, because the mean of its divisors is an integer number (18576384).

Almost surely, 2^72757457 is an apocalyptic number.

It is an amenable number.

72757457 is a deficient number, since it is larger than the sum of its proper divisors (1548079).

72757457 is a wasteful number, since it uses less digits than its factorization.

72757457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548078.

The product of its digits is 480200, while the sum is 44.

The square root of 72757457 is about 8529.7981804964. The cubic root of 72757457 is about 417.4705432980.

The spelling of 72757457 in words is "seventy-two million, seven hundred fifty-seven thousand, four hundred fifty-seven".