76928421 has 4 divisors (see below), whose sum is σ = 102571232. Its totient is φ = 51285612.

The previous prime is 76928363. The next prime is 76928431. The reversal of 76928421 is 12482967.

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.

It is not a de Polignac number, because 76928421 - 2¹³ = 76920229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76928421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76928431) 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, 12821401 + ... + 12821406.

It is an arithmetic number, because the mean of its divisors is an integer number (25642808).

Almost surely, 2^76928421 is an apocalyptic number.

It is an amenable number.

76928421 is a deficient number, since it is larger than the sum of its proper divisors (25642811).

76928421 is a wasteful number, since it uses less digits than its factorization.

76928421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25642810.

The product of its digits is 48384, while the sum is 39.

The square root of 76928421 is about 8770.8848470380. The cubic root of 76928421 is about 425.3002187876.

The spelling of 76928421 in words is "seventy-six million, nine hundred twenty-eight thousand, four hundred twenty-one".