77700013 has 4 divisors (see below), whose sum is σ = 82270620. Its totient is φ = 73129408.

The previous prime is 77700001. The next prime is 77700023. The reversal of 77700013 is 31000777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31000777 = 47 ⋅659591.

It can be written as a sum of positive squares in 2 ways, for example, as 52969284 + 24730729 = 7278^2 + 4973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77700013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77700023) 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, 2285278 + ... + 2285311.

It is an arithmetic number, because the mean of its divisors is an integer number (20567655).

Almost surely, 2^77700013 is an apocalyptic number.

It is an amenable number.

77700013 is a deficient number, since it is larger than the sum of its proper divisors (4570607).

77700013 is a wasteful number, since it uses less digits than its factorization.

77700013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4570606.

The product of its (nonzero) digits is 1029, while the sum is 25.

The square root of 77700013 is about 8814.7610858151. The cubic root of 77700013 is about 426.7174114314.

The spelling of 77700013 in words is "seventy-seven million, seven hundred thousand, thirteen".