77994091 has 4 divisors (see below), whose sum is σ = 89136112. Its totient is φ = 66852072.

The previous prime is 77994083. The next prime is 77994101. The reversal of 77994091 is 19049977.

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

It is not a de Polignac number, because 77994091 - 2³ = 77994083 is a prime.

It is a super-3 number, since 3×77994091³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77994041) 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, 5571000 + ... + 5571013.

It is an arithmetic number, because the mean of its divisors is an integer number (22284028).

Almost surely, 2^77994091 is an apocalyptic number.

77994091 is a deficient number, since it is larger than the sum of its proper divisors (11142021).

77994091 is a wasteful number, since it uses less digits than its factorization.

77994091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11142020.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 77994091 is about 8831.4263287421. The cubic root of 77994091 is about 427.2550785212.

The spelling of 77994091 in words is "seventy-seven million, nine hundred ninety-four thousand, ninety-one".