77880891 has 8 divisors (see below), whose sum is σ = 113281344. Its totient is φ = 47200520.

The previous prime is 77880889. The next prime is 77880919. The reversal of 77880891 is 19808877.

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

It is a cyclic number.

It is not a de Polignac number, because 77880891 - 2¹ = 77880889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77880891.

It is not an unprimeable number, because it can be changed into a prime (77880811) 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, 1179981 + ... + 1180046.

It is an arithmetic number, because the mean of its divisors is an integer number (14160168).

Almost surely, 2^77880891 is an apocalyptic number.

77880891 is a deficient number, since it is larger than the sum of its proper divisors (35400453).

77880891 is a wasteful number, since it uses less digits than its factorization.

77880891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360041.

The product of its (nonzero) digits is 225792, while the sum is 48.

The square root of 77880891 is about 8825.0150708087. The cubic root of 77880891 is about 427.0482735691.

The spelling of 77880891 in words is "seventy-seven million, eight hundred eighty thousand, eight hundred ninety-one".