72761623 has 4 divisors (see below), whose sum is σ = 79376328. Its totient is φ = 66146920.

The previous prime is 72761599. The next prime is 72761629. The reversal of 72761623 is 32616727.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72761623 - 2²¹ = 70664471 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 (72761629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3307336 + ... + 3307357.

It is an arithmetic number, because the mean of its divisors is an integer number (19844082).

Almost surely, 2^72761623 is an apocalyptic number.

72761623 is a deficient number, since it is larger than the sum of its proper divisors (6614705).

72761623 is a wasteful number, since it uses less digits than its factorization.

72761623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6614704.

The product of its digits is 21168, while the sum is 34.

The square root of 72761623 is about 8530.0423797306. The cubic root of 72761623 is about 417.4785110911.

Subtracting from 72761623 its reverse (32616727), we obtain a square (40144896 = 6336²).

The spelling of 72761623 in words is "seventy-two million, seven hundred sixty-one thousand, six hundred twenty-three".