76778766 has 48 divisors (see below), whose sum is σ = 182682864. Its totient is φ = 24084864.

The previous prime is 76778743. The next prime is 76778789. The reversal of 76778766 is 66787767.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (76778743) and next prime (76778789).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3616 + ... + 12908.

It is an arithmetic number, because the mean of its divisors is an integer number (3805893).

Almost surely, 2^76778766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 76778766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91341432).

76778766 is an abundant number, since it is smaller than the sum of its proper divisors (105904098).

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

76778766 is a wasteful number, since it uses less digits than its factorization.

76778766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9327 (or 9315 counting only the distinct ones).

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

The square root of 76778766 is about 8762.3493424994. The cubic root of 76778766 is about 425.0242495967.

Subtracting from 76778766 its reverse (66787767), we obtain a palindrome (9990999).

The spelling of 76778766 in words is "seventy-six million, seven hundred seventy-eight thousand, seven hundred sixty-six".