72978369 has 4 divisors (see below), whose sum is σ = 97304496. Its totient is φ = 48652244.

The previous prime is 72978329. The next prime is 72978377. The reversal of 72978369 is 96387927.

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: 96387927 = 3 ⋅32129309.

It is a cyclic number.

It is not a de Polignac number, because 72978369 - 2⁹ = 72977857 is a prime.

It is a super-2 number, since 2×72978369² = 10651684683800322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72978329) 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, 12163059 + ... + 12163064.

It is an arithmetic number, because the mean of its divisors is an integer number (24326124).

Almost surely, 2^72978369 is an apocalyptic number.

It is an amenable number.

72978369 is a deficient number, since it is larger than the sum of its proper divisors (24326127).

72978369 is a wasteful number, since it uses less digits than its factorization.

72978369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24326126.

The product of its digits is 1143072, while the sum is 51.

The square root of 72978369 is about 8542.7377930029. The cubic root of 72978369 is about 417.8926355208.

The spelling of 72978369 in words is "seventy-two million, nine hundred seventy-eight thousand, three hundred sixty-nine".