78776838 has 24 divisors (see below), whose sum is σ = 195066768. Its totient is φ = 22507632.

The previous prime is 78776833. The next prime is 78776839. The reversal of 78776838 is 83867787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78776833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312481 + ... + 312732.

It is an arithmetic number, because the mean of its divisors is an integer number (8127782).

Almost surely, 2^78776838 is an apocalyptic number.

78776838 is an abundant number, since it is smaller than the sum of its proper divisors (116289930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78776838 is a wasteful number, since it uses less digits than its factorization.

78776838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625228 (or 625225 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 78776838 is about 8875.6316958288. The cubic root of 78776838 is about 428.6796310605.

The spelling of 78776838 in words is "seventy-eight million, seven hundred seventy-six thousand, eight hundred thirty-eight".