77845641 has 16 divisors (see below), whose sum is σ = 109684800. Its totient is φ = 48973248.

The previous prime is 77845637. The next prime is 77845661. The reversal of 77845641 is 14654877.

It is not a de Polignac number, because 77845641 - 2² = 77845637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77845593 and 77845602.

It is not an unprimeable number, because it can be changed into a prime (77845661) 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, 12795 + ... + 17871.

It is an arithmetic number, because the mean of its divisors is an integer number (6855300).

Almost surely, 2^77845641 is an apocalyptic number.

It is an amenable number.

77845641 is a deficient number, since it is larger than the sum of its proper divisors (31839159).

77845641 is a wasteful number, since it uses less digits than its factorization.

77845641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5368.

The product of its digits is 188160, while the sum is 42.

The square root of 77845641 is about 8823.0176810431. The cubic root of 77845641 is about 426.9838344700.

The spelling of 77845641 in words is "seventy-seven million, eight hundred forty-five thousand, six hundred forty-one".