77130813 has 8 divisors (see below), whose sum is σ = 103138848. Its totient is φ = 51271664.

The previous prime is 77130793. The next prime is 77130817. The reversal of 77130813 is 31803177.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77130813 - 2¹² = 77126717 is a prime.

It is a super-3 number, since 3×77130813³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77130817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36006 + ... + 38087.

It is an arithmetic number, because the mean of its divisors is an integer number (12892356).

Almost surely, 2^77130813 is an apocalyptic number.

It is an amenable number.

77130813 is a deficient number, since it is larger than the sum of its proper divisors (26008035).

77130813 is a wasteful number, since it uses less digits than its factorization.

77130813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74443.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 77130813 is about 8782.4149867790. The cubic root of 77130813 is about 425.6728681654.

The spelling of 77130813 in words is "seventy-seven million, one hundred thirty thousand, eight hundred thirteen".