76643513 has 4 divisors (see below), whose sum is σ = 76697088. Its totient is φ = 76589940.

The previous prime is 76643467. The next prime is 76643519. The reversal of 76643513 is 31534667.

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: 31534667 = 79 ⋅399173.

It is a cyclic number.

It is not a de Polignac number, because 76643513 - 2⁶ = 76643449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76643519) 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, 24581 + ... + 27522.

It is an arithmetic number, because the mean of its divisors is an integer number (19174272).

Almost surely, 2^76643513 is an apocalyptic number.

It is an amenable number.

76643513 is a deficient number, since it is larger than the sum of its proper divisors (53575).

76643513 is a wasteful number, since it uses less digits than its factorization.

76643513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53574.

The product of its digits is 45360, while the sum is 35.

The square root of 76643513 is about 8754.6280903303. The cubic root of 76643513 is about 424.7745295398.

The spelling of 76643513 in words is "seventy-six million, six hundred forty-three thousand, five hundred thirteen".