77908646 has 8 divisors (see below), whose sum is σ = 116907840. Its totient is φ = 38939368.

The previous prime is 77908631. The next prime is 77908661. The reversal of 77908646 is 64680977.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77908631) and next prime (77908661).

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

It is a self number, because there is not a number n which added to its sum of digits gives 77908646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 920 + ... + 12516.

It is an arithmetic number, because the mean of its divisors is an integer number (14613480).

Almost surely, 2^77908646 is an apocalyptic number.

77908646 is a deficient number, since it is larger than the sum of its proper divisors (38999194).

77908646 is a wasteful number, since it uses less digits than its factorization.

77908646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14958.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 77908646 is about 8826.5874492921. The cubic root of 77908646 is about 427.0989976810.

The spelling of 77908646 in words is "seventy-seven million, nine hundred eight thousand, six hundred forty-six".