72749197 has 4 divisors (see below), whose sum is σ = 75257820. Its totient is φ = 70240576.

The previous prime is 72749177. The next prime is 72749297. The reversal of 72749197 is 79194727.

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 61011721 + 11737476 = 7811^2 + 3426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72749197 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 (72749177) 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, 1254268 + ... + 1254325.

It is an arithmetic number, because the mean of its divisors is an integer number (18814455).

Almost surely, 2^72749197 is an apocalyptic number.

It is an amenable number.

72749197 is a deficient number, since it is larger than the sum of its proper divisors (2508623).

72749197 is a wasteful number, since it uses less digits than its factorization.

72749197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508622.

The product of its digits is 222264, while the sum is 46.

The square root of 72749197 is about 8529.3139817924. The cubic root of 72749197 is about 417.4547445180.

It can be divided in two parts, 7274 and 9197, that added together give a triangular number (16471 = T₁₈₁).

The spelling of 72749197 in words is "seventy-two million, seven hundred forty-nine thousand, one hundred ninety-seven".