72767421 has 12 divisors (see below), whose sum is σ = 107345472. Its totient is φ = 47479176.

The previous prime is 72767407. The next prime is 72767441. The reversal of 72767421 is 12476727.

It is a happy number.

It is not a de Polignac number, because 72767421 - 2⁹ = 72766909 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72767441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85591 + ... + 86436.

It is an arithmetic number, because the mean of its divisors is an integer number (8945456).

Almost surely, 2^72767421 is an apocalyptic number.

It is an amenable number.

72767421 is a deficient number, since it is larger than the sum of its proper divisors (34578051).

72767421 is a wasteful number, since it uses less digits than its factorization.

72767421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172080 (or 172077 counting only the distinct ones).

The product of its digits is 32928, while the sum is 36.

The square root of 72767421 is about 8530.3822305920. The cubic root of 72767421 is about 417.4895997027.

The spelling of 72767421 in words is "seventy-two million, seven hundred sixty-seven thousand, four hundred twenty-one".