77670863 has 4 divisors (see below), whose sum is σ = 77761728. Its totient is φ = 77580000.

The previous prime is 77670833. The next prime is 77670871. The reversal of 77670863 is 36807677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36807677 = 197 ⋅186841.

It is a cyclic number.

It is not a de Polignac number, because 77670863 - 2¹⁸ = 77408719 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 (77670833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44138 + ... + 45863.

It is an arithmetic number, because the mean of its divisors is an integer number (19440432).

Almost surely, 2^77670863 is an apocalyptic number.

77670863 is a deficient number, since it is larger than the sum of its proper divisors (90865).

77670863 is an equidigital number, since it uses as much as digits as its factorization.

77670863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90864.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 77670863 is about 8813.1074542411. The cubic root of 77670863 is about 426.6640422066.

The spelling of 77670863 in words is "seventy-seven million, six hundred seventy thousand, eight hundred sixty-three".