76128321 has 8 divisors (see below), whose sum is σ = 105917760. Its totient is φ = 48545552.

The previous prime is 76128317. The next prime is 76128331. The reversal of 76128321 is 12382167.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 76128321 - 2² = 76128317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76128301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551586 + ... + 551723.

It is an arithmetic number, because the mean of its divisors is an integer number (13239720).

Almost surely, 2^76128321 is an apocalyptic number.

It is an amenable number.

76128321 is a deficient number, since it is larger than the sum of its proper divisors (29789439).

76128321 is a wasteful number, since it uses less digits than its factorization.

76128321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103335.

The product of its digits is 4032, while the sum is 30.

The square root of 76128321 is about 8725.1544971995. The cubic root of 76128321 is about 423.8206213603.

The spelling of 76128321 in words is "seventy-six million, one hundred twenty-eight thousand, three hundred twenty-one".