77500013 has 4 divisors (see below), whose sum is σ = 77529180. Its totient is φ = 77470848.

The previous prime is 77499973. The next prime is 77500063. The reversal of 77500013 is 31000577.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31000577 = 389 ⋅79693.

It can be written as a sum of positive squares in 2 ways, for example, as 20994724 + 56505289 = 4582^2 + 7517^2 .

It is a cyclic number.

It is not a de Polignac number, because 77500013 - 2¹⁰ = 77498989 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 (77500063) 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, 10148 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (19382295).

Almost surely, 2^77500013 is an apocalyptic number.

It is an amenable number.

77500013 is a deficient number, since it is larger than the sum of its proper divisors (29167).

77500013 is a wasteful number, since it uses less digits than its factorization.

77500013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29166.

The product of its (nonzero) digits is 735, while the sum is 23.

The square root of 77500013 is about 8803.4091691799. The cubic root of 77500013 is about 426.3509730031.

The spelling of 77500013 in words is "seventy-seven million, five hundred thousand, thirteen".