76999978 has 8 divisors (see below), whose sum is σ = 126000000. Its totient is φ = 34999980.

The previous prime is 76999963. The next prime is 76999981. The reversal of 76999978 is 87999967.

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

It is a super-2 number, since 2×76999978² = 11857993224000968, which contains 22 as substring.

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, 1749978 + ... + 1750021.

It is an arithmetic number, because the mean of its divisors is an integer number (15750000).

Almost surely, 2^76999978 is an apocalyptic number.

76999978 is a deficient number, since it is larger than the sum of its proper divisors (49000022).

76999978 is a wasteful number, since it uses less digits than its factorization.

76999978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3500012.

The product of its digits is 15431472, while the sum is 64.

The square root of 76999978 is about 8774.9631338257. The cubic root of 76999978 is about 425.4320459942.

It can be divided in two parts, 769999 and 78, that added together give a palindrome (770077).

The spelling of 76999978 in words is "seventy-six million, nine hundred ninety-nine thousand, nine hundred seventy-eight".