76513821 has 16 divisors (see below), whose sum is σ = 110061504. Its totient is φ = 47101184.

The previous prime is 76513819. The next prime is 76513841. The reversal of 76513821 is 12831567.

It is a cyclic number.

It is not a de Polignac number, because 76513821 - 2¹ = 76513819 is a prime.

76513821 is a modest number, since divided by 13821 gives 765 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76513841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11451 + ... + 16856.

It is an arithmetic number, because the mean of its divisors is an integer number (6878844).

Almost surely, 2^76513821 is an apocalyptic number.

It is an amenable number.

76513821 is a deficient number, since it is larger than the sum of its proper divisors (33547683).

76513821 is a wasteful number, since it uses less digits than its factorization.

76513821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28380.

The product of its digits is 10080, while the sum is 33.

The square root of 76513821 is about 8747.2179005670. The cubic root of 76513821 is about 424.5348007890.

The spelling of 76513821 in words is "seventy-six million, five hundred thirteen thousand, eight hundred twenty-one".