72859665 has 16 divisors (see below), whose sum is σ = 119419776. Its totient is φ = 37910400.

The previous prime is 72859651. The next prime is 72859693. The reversal of 72859665 is 56695827.

It is a happy number.

It is not a de Polignac number, because 72859665 - 2⁴ = 72859649 is a prime.

It is a super-3 number, since 3×72859665³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58621 + ... + 59850.

It is an arithmetic number, because the mean of its divisors is an integer number (7463736).

Almost surely, 2^72859665 is an apocalyptic number.

It is an amenable number.

72859665 is a deficient number, since it is larger than the sum of its proper divisors (46560111).

72859665 is a wasteful number, since it uses less digits than its factorization.

72859665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118520.

The product of its digits is 907200, while the sum is 48.

The square root of 72859665 is about 8535.7873099088. The cubic root of 72859665 is about 417.6659361671.

The spelling of 72859665 in words is "seventy-two million, eight hundred fifty-nine thousand, six hundred sixty-five".