77897833 has 8 divisors (see below), whose sum is σ = 83978888. Its totient is φ = 71829504.

The previous prime is 77897797. The next prime is 77897837. The reversal of 77897833 is 33879877.

It can be written as a sum of positive squares in 4 ways, for example, as 8225424 + 69672409 = 2868^2 + 8347^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77897833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77897837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12391 + ... + 17587.

It is an arithmetic number, because the mean of its divisors is an integer number (10497361).

Almost surely, 2^77897833 is an apocalyptic number.

It is an amenable number.

77897833 is a deficient number, since it is larger than the sum of its proper divisors (6081055).

77897833 is a wasteful number, since it uses less digits than its factorization.

77897833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6363.

The product of its digits is 1778112, while the sum is 52.

The square root of 77897833 is about 8825.9749036580. The cubic root of 77897833 is about 427.0792376357.

The spelling of 77897833 in words is "seventy-seven million, eight hundred ninety-seven thousand, eight hundred thirty-three".