76720507 has 4 divisors (see below), whose sum is σ = 81233496. Its totient is φ = 72207520.

The previous prime is 76720481. The next prime is 76720513. The reversal of 76720507 is 70502767.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70502767 = 311 ⋅226697.

It is a cyclic number.

It is not a de Polignac number, because 76720507 - 2⁷ = 76720379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76720577) 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, 2256469 + ... + 2256502.

It is an arithmetic number, because the mean of its divisors is an integer number (20308374).

Almost surely, 2^76720507 is an apocalyptic number.

76720507 is a deficient number, since it is larger than the sum of its proper divisors (4512989).

76720507 is a wasteful number, since it uses less digits than its factorization.

76720507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4512988.

The product of its (nonzero) digits is 20580, while the sum is 34.

The square root of 76720507 is about 8759.0243178107. The cubic root of 76720507 is about 424.9167209374.

The spelling of 76720507 in words is "seventy-six million, seven hundred twenty thousand, five hundred seven".