76552721 has 16 divisors (see below), whose sum is σ = 91190400. Its totient is φ = 62875008.

The previous prime is 76552709. The next prime is 76552739. The reversal of 76552721 is 12725567.

It is a happy number.

It is not a de Polignac number, because 76552721 - 2¹⁴ = 76536337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76554721) 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, 26861 + ... + 29573.

It is an arithmetic number, because the mean of its divisors is an integer number (5699400).

Almost surely, 2^76552721 is an apocalyptic number.

It is an amenable number.

76552721 is a deficient number, since it is larger than the sum of its proper divisors (14637679).

76552721 is a wasteful number, since it uses less digits than its factorization.

76552721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888.

The product of its digits is 29400, while the sum is 35.

The square root of 76552721 is about 8749.4411821556. The cubic root of 76552721 is about 424.6067337882.

The spelling of 76552721 in words is "seventy-six million, five hundred fifty-two thousand, seven hundred twenty-one".