72251757 has 10 divisors (see below), whose sum is σ = 107931758. Its totient is φ = 48167784.

The previous prime is 72251747. The next prime is 72251771. The reversal of 72251757 is 75715227.

It can be written as a sum of positive squares in only one way, i.e., 49154121 + 23097636 = 7011^2 + 4806^2 .

It is not a de Polignac number, because 72251757 - 2⁷ = 72251629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72251747) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 445918 + ... + 446079.

Almost surely, 2^72251757 is an apocalyptic number.

It is an amenable number.

72251757 is a deficient number, since it is larger than the sum of its proper divisors (35680001).

72251757 is an equidigital number, since it uses as much as digits as its factorization.

72251757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892009 (or 892000 counting only the distinct ones).

The product of its digits is 34300, while the sum is 36.

The square root of 72251757 is about 8500.1033523128. The cubic root of 72251757 is about 416.5010854253.

The spelling of 72251757 in words is "seventy-two million, two hundred fifty-one thousand, seven hundred fifty-seven".