76526221 has 4 divisors (see below), whose sum is σ = 79853472. Its totient is φ = 73198972.

The previous prime is 76526209. The next prime is 76526239. The reversal of 76526221 is 12262567.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12262567 = 41 ⋅299087.

It is not a de Polignac number, because 76526221 - 2¹⁷ = 76395149 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76520221) 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, 1663591 + ... + 1663636.

It is an arithmetic number, because the mean of its divisors is an integer number (19963368).

Almost surely, 2^76526221 is an apocalyptic number.

It is an amenable number.

76526221 is a deficient number, since it is larger than the sum of its proper divisors (3327251).

76526221 is a wasteful number, since it uses less digits than its factorization.

76526221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3327250.

The product of its digits is 10080, while the sum is 31.

The square root of 76526221 is about 8747.9266686455. The cubic root of 76526221 is about 424.5577332349.

Adding to 76526221 its reverse (12262567), we get a palindrome (88788788).

The spelling of 76526221 in words is "seventy-six million, five hundred twenty-six thousand, two hundred twenty-one".