77945643 has 24 divisors (see below), whose sum is σ = 120670368. Its totient is φ = 48356352.

The previous prime is 77945641. The next prime is 77945653. The reversal of 77945643 is 34654977.

It is not a de Polignac number, because 77945643 - 2¹ = 77945641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77945641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2571 + ... + 12747.

It is an arithmetic number, because the mean of its divisors is an integer number (5027932).

Almost surely, 2^77945643 is an apocalyptic number.

77945643 is a deficient number, since it is larger than the sum of its proper divisors (42724725).

77945643 is a wasteful number, since it uses less digits than its factorization.

77945643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10243 (or 10240 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 77945643 is about 8828.6829708626. The cubic root of 77945643 is about 427.1665934351.

The spelling of 77945643 in words is "seventy-seven million, nine hundred forty-five thousand, six hundred forty-three".