77891943 has 16 divisors (see below), whose sum is σ = 110236896. Its totient is φ = 48752640.

The previous prime is 77891929. The next prime is 77891951. The reversal of 77891943 is 34919877.

It is not a de Polignac number, because 77891943 - 2⁵ = 77891911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77891892 and 77891901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77891903) 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, 21855 + ... + 25167.

It is an arithmetic number, because the mean of its divisors is an integer number (6889806).

Almost surely, 2^77891943 is an apocalyptic number.

77891943 is a deficient number, since it is larger than the sum of its proper divisors (32344953).

77891943 is a wasteful number, since it uses less digits than its factorization.

77891943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3794.

The product of its digits is 381024, while the sum is 48.

The square root of 77891943 is about 8825.6412231633. The cubic root of 77891943 is about 427.0684732792.

The spelling of 77891943 in words is "seventy-seven million, eight hundred ninety-one thousand, nine hundred forty-three".