72676421 has 4 divisors (see below), whose sum is σ = 73493100. Its totient is φ = 71859744.

The previous prime is 72676403. The next prime is 72676423. The reversal of 72676421 is 12467627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12467627 = 823 ⋅15149.

It can be written as a sum of positive squares in 2 ways, for example, as 8916196 + 63760225 = 2986^2 + 7985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72676421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72676423) 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, 408206 + ... + 408383.

It is an arithmetic number, because the mean of its divisors is an integer number (18373275).

Almost surely, 2^72676421 is an apocalyptic number.

It is an amenable number.

72676421 is a deficient number, since it is larger than the sum of its proper divisors (816679).

72676421 is an equidigital number, since it uses as much as digits as its factorization.

72676421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816678.

The product of its digits is 28224, while the sum is 35.

The square root of 72676421 is about 8525.0466860892. The cubic root of 72676421 is about 417.3154952249.

The spelling of 72676421 in words is "seventy-two million, six hundred seventy-six thousand, four hundred twenty-one".