77906987 has 8 divisors (see below), whose sum is σ = 79706880. Its totient is φ = 76127040.

The previous prime is 77906981. The next prime is 77906989. The reversal of 77906987 is 78960977.

It is a happy number.

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 77906987 - 2⁶ = 77906923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77906981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3062 + ... + 12852.

It is an arithmetic number, because the mean of its divisors is an integer number (9963360).

Almost surely, 2^77906987 is an apocalyptic number.

77906987 is a deficient number, since it is larger than the sum of its proper divisors (1799893).

77906987 is a wasteful number, since it uses less digits than its factorization.

77906987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9973.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 77906987 is about 8826.4934713622. The cubic root of 77906987 is about 427.0959660865.

The spelling of 77906987 in words is "seventy-seven million, nine hundred six thousand, nine hundred eighty-seven".