72615751 has 6 divisors (see below), whose sum is σ = 78631440. Its totient is φ = 67029768.

The previous prime is 72615737. The next prime is 72615757. The reversal of 72615751 is 15751627.

It is a happy number.

It is not a de Polignac number, because 72615751 - 2²¹ = 70518599 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 (72615757) 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 5 ways as a sum of consecutive naturals, for example, 214671 + ... + 215008.

It is an arithmetic number, because the mean of its divisors is an integer number (13105240).

Almost surely, 2^72615751 is an apocalyptic number.

72615751 is a deficient number, since it is larger than the sum of its proper divisors (6015689).

72615751 is a wasteful number, since it uses less digits than its factorization.

72615751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429705 (or 429692 counting only the distinct ones).

The product of its digits is 14700, while the sum is 34.

The square root of 72615751 is about 8521.4876048728. The cubic root of 72615751 is about 417.1993384335.

The spelling of 72615751 in words is "seventy-two million, six hundred fifteen thousand, seven hundred fifty-one".