72851631 has 8 divisors (see below), whose sum is σ = 99760944. Its totient is φ = 47255040.

The previous prime is 72851621. The next prime is 72851641. The reversal of 72851631 is 13615827.

It is an interprime number because it is at equal distance from previous prime (72851621) and next prime (72851641).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72851631 - 2⁵ = 72851599 is a prime.

It is a super-2 number, since 2×72851631² = 10614720278720322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72851592 and 72851601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72851621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328050 + ... + 328271.

It is an arithmetic number, because the mean of its divisors is an integer number (12470118).

Almost surely, 2^72851631 is an apocalyptic number.

72851631 is a deficient number, since it is larger than the sum of its proper divisors (26909313).

72851631 is a wasteful number, since it uses less digits than its factorization.

72851631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656361.

The product of its digits is 10080, while the sum is 33.

The square root of 72851631 is about 8535.3166900824. The cubic root of 72851631 is about 417.6505840448.

The spelling of 72851631 in words is "seventy-two million, eight hundred fifty-one thousand, six hundred thirty-one".