77980678 has 8 divisors (see below), whose sum is σ = 117008568. Its totient is φ = 38977824.

The previous prime is 77980627. The next prime is 77980709. The reversal of 77980678 is 87608977.

It is a happy number.

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

It is a super-2 number, since 2×77980678² = 12161972282679368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8350 + ... + 15022.

It is an arithmetic number, because the mean of its divisors is an integer number (14626071).

Almost surely, 2^77980678 is an apocalyptic number.

77980678 is a deficient number, since it is larger than the sum of its proper divisors (39027890).

77980678 is a wasteful number, since it uses less digits than its factorization.

77980678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12518.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 77980678 is about 8830.6669057325. Note that the first 3 decimals coincide. The cubic root of 77980678 is about 427.2305847814.

The spelling of 77980678 in words is "seventy-seven million, nine hundred eighty thousand, six hundred seventy-eight".