72406869 has 4 divisors (see below), whose sum is σ = 96542496. Its totient is φ = 48271244.

The previous prime is 72406843. The next prime is 72406877. The reversal of 72406869 is 96860427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96860427 = 3 ⋅32286809.

It is a cyclic number.

It is not a de Polignac number, because 72406869 - 2⁸ = 72406613 is a prime.

It is a super-2 number, since 2×72406869² = 10485509356766322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72406869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72406819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12067809 + ... + 12067814.

It is an arithmetic number, because the mean of its divisors is an integer number (24135624).

Almost surely, 2^72406869 is an apocalyptic number.

It is an amenable number.

72406869 is a deficient number, since it is larger than the sum of its proper divisors (24135627).

72406869 is a wasteful number, since it uses less digits than its factorization.

72406869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24135626.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 72406869 is about 8509.2225849369. Note that the first 3 decimals coincide. The cubic root of 72406869 is about 416.7989242724.

The spelling of 72406869 in words is "seventy-two million, four hundred six thousand, eight hundred sixty-nine".