77963813 has 8 divisors (see below), whose sum is σ = 82569408. Its totient is φ = 73459584.

The previous prime is 77963807. The next prime is 77963827. The reversal of 77963813 is 31836977.

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 77963813 - 2⁴ = 77963797 is a prime.

It is a super-2 number, since 2×77963813² = 12156712274997938, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77963833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23756 + ... + 26837.

It is an arithmetic number, because the mean of its divisors is an integer number (10321176).

Almost surely, 2^77963813 is an apocalyptic number.

It is an amenable number.

77963813 is a deficient number, since it is larger than the sum of its proper divisors (4605595).

77963813 is a wasteful number, since it uses less digits than its factorization.

77963813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50683.

The product of its digits is 190512, while the sum is 44.

The square root of 77963813 is about 8829.7119432063. The cubic root of 77963813 is about 427.1997832910.

The spelling of 77963813 in words is "seventy-seven million, nine hundred sixty-three thousand, eight hundred thirteen".