76771640 has 32 divisors (see below), whose sum is σ = 188440560. Its totient is φ = 27916800.

The previous prime is 76771637. The next prime is 76771657. The reversal of 76771640 is 4617767.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 76771594 and 76771603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86801 + ... + 87680.

Almost surely, 2^76771640 is an apocalyptic number.

It is an amenable number.

76771640 is an abundant number, since it is smaller than the sum of its proper divisors (111668920).

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

76771640 is a wasteful number, since it uses less digits than its factorization.

76771640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174503 (or 174499 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 76771640 is about 8761.9427069572. The cubic root of 76771640 is about 425.0111000561.

The spelling of 76771640 in words is "seventy-six million, seven hundred seventy-one thousand, six hundred forty".