72745245 has 24 divisors (see below), whose sum is σ = 128163672. Its totient is φ = 38160000.

The previous prime is 72745241. The next prime is 72745249. The reversal of 72745245 is 54254727.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72745241) and next prime (72745249).

It can be written as a sum of positive squares in 4 ways, for example, as 257049 + 72488196 = 507^2 + 8514^2 .

It is not a de Polignac number, because 72745245 - 2² = 72745241 is a prime.

It is a super-2 number, since 2×72745245² = 10583741340220050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72745241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10506 + ... + 15995.

It is an arithmetic number, because the mean of its divisors is an integer number (5340153).

Almost surely, 2^72745245 is an apocalyptic number.

It is an amenable number.

72745245 is a deficient number, since it is larger than the sum of its proper divisors (55418427).

72745245 is a wasteful number, since it uses less digits than its factorization.

72745245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26573 (or 26570 counting only the distinct ones).

The product of its digits is 78400, while the sum is 36.

The square root of 72745245 is about 8529.0823070246. The cubic root of 72745245 is about 417.4471851629.

The spelling of 72745245 in words is "seventy-two million, seven hundred forty-five thousand, two hundred forty-five".