78900778 has 8 divisors (see below), whose sum is σ = 129110400. Its totient is φ = 35863980.

The previous prime is 78900737. The next prime is 78900823. The reversal of 78900778 is 87700987.

It is a happy number.

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

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, 1793178 + ... + 1793221.

It is an arithmetic number, because the mean of its divisors is an integer number (16138800).

Almost surely, 2^78900778 is an apocalyptic number.

78900778 is a deficient number, since it is larger than the sum of its proper divisors (50209622).

78900778 is a wasteful number, since it uses less digits than its factorization.

78900778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586412.

The product of its (nonzero) digits is 197568, while the sum is 46.

The square root of 78900778 is about 8882.6109900186. The cubic root of 78900778 is about 428.9043278776.

The spelling of 78900778 in words is "seventy-eight million, nine hundred thousand, seven hundred seventy-eight".