72437431 has 4 divisors (see below), whose sum is σ = 79022664. Its totient is φ = 65852200.

The previous prime is 72437429. The next prime is 72437437. The reversal of 72437431 is 13473427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13473427 = 11 ⋅1224857.

It is a cyclic number.

It is not a de Polignac number, because 72437431 - 2¹ = 72437429 is a prime.

It is a super-2 number, since 2×72437431² = 10494362819759522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72437393 and 72437402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72437437) 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, 3292600 + ... + 3292621.

It is an arithmetic number, because the mean of its divisors is an integer number (19755666).

Almost surely, 2^72437431 is an apocalyptic number.

72437431 is a deficient number, since it is larger than the sum of its proper divisors (6585233).

72437431 is a wasteful number, since it uses less digits than its factorization.

72437431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6585232.

The product of its digits is 14112, while the sum is 31.

The square root of 72437431 is about 8511.0182117065. The cubic root of 72437431 is about 416.8575578298.

The spelling of 72437431 in words is "seventy-two million, four hundred thirty-seven thousand, four hundred thirty-one".