72697745 has 8 divisors (see below), whose sum is σ = 87720360. Its totient is φ = 57836160.

The previous prime is 72697741. The next prime is 72697771. The reversal of 72697745 is 54779627.

It can be written as a sum of positive squares in 4 ways, for example, as 1868689 + 70829056 = 1367^2 + 8416^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72697745 - 2² = 72697741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72697745.

It is not an unprimeable number, because it can be changed into a prime (72697741) 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, 39260 + ... + 41069.

It is an arithmetic number, because the mean of its divisors is an integer number (10965045).

Almost surely, 2^72697745 is an apocalyptic number.

It is an amenable number.

72697745 is a deficient number, since it is larger than the sum of its proper divisors (15022615).

72697745 is a wasteful number, since it uses less digits than its factorization.

72697745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80515.

The product of its digits is 740880, while the sum is 47.

The square root of 72697745 is about 8526.2972620007. The cubic root of 72697745 is about 417.3563061019.

The spelling of 72697745 in words is "seventy-two million, six hundred ninety-seven thousand, seven hundred forty-five".