77945811 has 16 divisors (see below), whose sum is σ = 107563008. Its totient is φ = 50155200.

The previous prime is 77945801. The next prime is 77945821. The reversal of 77945811 is 11854977.

It is an interprime number because it is at equal distance from previous prime (77945801) and next prime (77945821).

It is not a de Polignac number, because 77945811 - 2⁷ = 77945683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77945801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44431 + ... + 46151.

It is an arithmetic number, because the mean of its divisors is an integer number (6722688).

Almost surely, 2^77945811 is an apocalyptic number.

77945811 is a deficient number, since it is larger than the sum of its proper divisors (29617197).

77945811 is a wasteful number, since it uses less digits than its factorization.

77945811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242.

The product of its digits is 70560, while the sum is 42.

The square root of 77945811 is about 8828.6924853004. The cubic root of 77945811 is about 427.1669003325.

The spelling of 77945811 in words is "seventy-seven million, nine hundred forty-five thousand, eight hundred eleven".