76766778 has 80 divisors (see below), whose sum is σ = 195915456. Its totient is φ = 22239360.

The previous prime is 76766773. The next prime is 76766779. The reversal of 76766778 is 87766767.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (76766771) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 40050 + ... + 41922.

Almost surely, 2^76766778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 76766778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97957728).

76766778 is an abundant number, since it is smaller than the sum of its proper divisors (119148678).

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

76766778 is a wasteful number, since it uses less digits than its factorization.

76766778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921 (or 1912 counting only the distinct ones).

The product of its digits is 4148928, while the sum is 54.

The square root of 76766778 is about 8761.6652526789. The cubic root of 76766778 is about 425.0021277863.

The spelling of 76766778 in words is "seventy-six million, seven hundred sixty-six thousand, seven hundred seventy-eight".