72727831 has 4 divisors (see below), whose sum is σ = 79339464. Its totient is φ = 66116200.

The previous prime is 72727807. The next prime is 72727843. The reversal of 72727831 is 13872727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13872727 = 11 ⋅1261157.

It is a cyclic number.

It is not a de Polignac number, because 72727831 - 2⁷ = 72727703 is a prime.

It is a super-2 number, since 2×72727831² = 10578674803929122, which contains 22 as substring.

It is a pancake number, because a pancake can be divided into 72727831 parts by 12060 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72727861) 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, 3305800 + ... + 3305821.

It is an arithmetic number, because the mean of its divisors is an integer number (19834866).

Almost surely, 2^72727831 is an apocalyptic number.

72727831 is a deficient number, since it is larger than the sum of its proper divisors (6611633).

72727831 is a wasteful number, since it uses less digits than its factorization.

72727831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6611632.

The product of its digits is 32928, while the sum is 37.

The square root of 72727831 is about 8528.0613858016. The cubic root of 72727831 is about 417.4138725369.

The spelling of 72727831 in words is "seventy-two million, seven hundred twenty-seven thousand, eight hundred thirty-one".