77846436 has 18 divisors (see below), whose sum is σ = 196778582. Its totient is φ = 25948800.

The previous prime is 77846387. The next prime is 77846437. The reversal of 77846436 is 63464877.

It can be written as a sum of positive squares in only one way, i.e., 53934336 + 23912100 = 7344^2 + 4890^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 77846391 and 77846400.

It is not an unprimeable number, because it can be changed into a prime (77846437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1081165 + ... + 1081236.

Almost surely, 2^77846436 is an apocalyptic number.

It is an amenable number.

77846436 is an abundant number, since it is smaller than the sum of its proper divisors (118932146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77846436 is a wasteful number, since it uses less digits than its factorization.

77846436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162411 (or 2162406 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 77846436 is about 8823.0627335410. The cubic root of 77846436 is about 426.9852879917.

The spelling of 77846436 in words is "seventy-seven million, eight hundred forty-six thousand, four hundred thirty-six".