77980895 has 4 divisors (see below), whose sum is σ = 93577080. Its totient is φ = 62384712.

The previous prime is 77980891. The next prime is 77980897. The reversal of 77980895 is 59808977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77980895 - 2² = 77980891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77980891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7798085 + ... + 7798094.

It is an arithmetic number, because the mean of its divisors is an integer number (23394270).

Almost surely, 2^77980895 is an apocalyptic number.

77980895 is a deficient number, since it is larger than the sum of its proper divisors (15596185).

77980895 is a wasteful number, since it uses less digits than its factorization.

77980895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15596184.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The square root of 77980895 is about 8830.6791924517. The cubic root of 77980895 is about 427.2309810716.

The spelling of 77980895 in words is "seventy-seven million, nine hundred eighty thousand, eight hundred ninety-five".