76409521 has 4 divisors (see below), whose sum is σ = 76442112. Its totient is φ = 76376932.

The previous prime is 76409497. The next prime is 76409533. The reversal of 76409521 is 12590467.

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.

It is a cyclic number.

It is not a de Polignac number, because 76409521 - 2⁹ = 76409009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76419521) 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, 12481 + ... + 17566.

It is an arithmetic number, because the mean of its divisors is an integer number (19110528).

Almost surely, 2^76409521 is an apocalyptic number.

It is an amenable number.

76409521 is a deficient number, since it is larger than the sum of its proper divisors (32591).

76409521 is a wasteful number, since it uses less digits than its factorization.

76409521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32590.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 76409521 is about 8741.2539718281. The cubic root of 76409521 is about 424.3418111911.

Adding to 76409521 its reverse (12590467), we get a palindrome (88999988).

It can be divided in two parts, 7640 and 9521, that added together give a square (17161 = 131²).

The spelling of 76409521 in words is "seventy-six million, four hundred nine thousand, five hundred twenty-one".