76442521 has 4 divisors (see below), whose sum is σ = 79078500. Its totient is φ = 73806544.

The previous prime is 76442507. The next prime is 76442543. The reversal of 76442521 is 12524467.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51552400 + 24890121 = 7180^2 + 4989^2 .

It is a cyclic number.

It is not a de Polignac number, because 76442521 - 2¹¹ = 76440473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76442581) 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, 1317946 + ... + 1318003.

It is an arithmetic number, because the mean of its divisors is an integer number (19769625).

Almost surely, 2^76442521 is an apocalyptic number.

It is an amenable number.

76442521 is a deficient number, since it is larger than the sum of its proper divisors (2635979).

76442521 is a wasteful number, since it uses less digits than its factorization.

76442521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635978.

The product of its digits is 13440, while the sum is 31.

The square root of 76442521 is about 8743.1413690961. The cubic root of 76442521 is about 424.4028911200.

Adding to 76442521 its reverse (12524467), we get a palindrome (88966988).

The spelling of 76442521 in words is "seventy-six million, four hundred forty-two thousand, five hundred twenty-one".