72902605 has 4 divisors (see below), whose sum is σ = 87483132. Its totient is φ = 58322080.

The previous prime is 72902603. The next prime is 72902623. The reversal of 72902605 is 50620927.

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 39100009 + 33802596 = 6253^2 + 5814^2 .

It is not a de Polignac number, because 72902605 - 2¹ = 72902603 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72902603) 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, 7290256 + ... + 7290265.

It is an arithmetic number, because the mean of its divisors is an integer number (21870783).

Almost surely, 2^72902605 is an apocalyptic number.

It is an amenable number.

72902605 is a deficient number, since it is larger than the sum of its proper divisors (14580527).

72902605 is a wasteful number, since it uses less digits than its factorization.

72902605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14580526.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 72902605 is about 8538.3022317086. The cubic root of 72902605 is about 417.7479708255.

The spelling of 72902605 in words is "seventy-two million, nine hundred two thousand, six hundred five".