72242831 has 4 divisors (see below), whose sum is σ = 72260952. Its totient is φ = 72224712.

The previous prime is 72242827. The next prime is 72242851. The reversal of 72242831 is 13824227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72242831 - 2² = 72242827 is a prime.

It is a super-2 number, since 2×72242831² = 10438053261789122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72242794 and 72242803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72242851) 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, 176 + ... + 12021.

It is an arithmetic number, because the mean of its divisors is an integer number (18065238).

Almost surely, 2^72242831 is an apocalyptic number.

72242831 is a deficient number, since it is larger than the sum of its proper divisors (18121).

72242831 is a wasteful number, since it uses less digits than its factorization.

72242831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18120.

The product of its digits is 5376, while the sum is 29.

The square root of 72242831 is about 8499.5782836562. The cubic root of 72242831 is about 416.4839331698.

The spelling of 72242831 in words is "seventy-two million, two hundred forty-two thousand, eight hundred thirty-one".