72427831 has 6 divisors (see below), whose sum is σ = 84252840. Its totient is φ = 62080956.

The previous prime is 72427793. The next prime is 72427879. The reversal of 72427831 is 13872427.

It is not a de Polignac number, because 72427831 - 2¹⁷ = 72296759 is a prime.

It is a super-2 number, since 2×72427831² = 10491581406729122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72427631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 739011 + ... + 739108.

It is an arithmetic number, because the mean of its divisors is an integer number (14042140).

Almost surely, 2^72427831 is an apocalyptic number.

72427831 is a deficient number, since it is larger than the sum of its proper divisors (11825009).

72427831 is a wasteful number, since it uses less digits than its factorization.

72427831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478133 (or 1478126 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 72427831 is about 8510.4542181954. The cubic root of 72427831 is about 416.8391418934.

The spelling of 72427831 in words is "seventy-two million, four hundred twenty-seven thousand, eight hundred thirty-one".