72678919 has 4 divisors (see below), whose sum is σ = 75838896. Its totient is φ = 69518944.

The previous prime is 72678889. The next prime is 72678923. The reversal of 72678919 is 91987627.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91987627 = 3389 ⋅27143.

It is a cyclic number.

It is not a de Polignac number, because 72678919 - 2⁵ = 72678887 is a prime.

It is a super-2 number, since 2×72678919² = 10564450534017122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72670919) 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, 1579954 + ... + 1579999.

It is an arithmetic number, because the mean of its divisors is an integer number (18959724).

Almost surely, 2^72678919 is an apocalyptic number.

72678919 is a deficient number, since it is larger than the sum of its proper divisors (3159977).

72678919 is a wasteful number, since it uses less digits than its factorization.

72678919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3159976.

The product of its digits is 381024, while the sum is 49.

The square root of 72678919 is about 8525.1931942918. The cubic root of 72678919 is about 417.3202764279.

The spelling of 72678919 in words is "seventy-two million, six hundred seventy-eight thousand, nine hundred nineteen".