76861640 has 32 divisors (see below), whose sum is σ = 176964480. Its totient is φ = 30028992.

The previous prime is 76861637. The next prime is 76861643. The reversal of 76861640 is 4616867.

It is an interprime number because it is at equal distance from previous prime (76861637) and next prime (76861643).

It is a junction number, because it is equal to n+sod(n) for n = 76861594 and 76861603.

It is not an unprimeable number, because it can be changed into a prime (76861643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20624 + ... + 24063.

It is an arithmetic number, because the mean of its divisors is an integer number (5530140).

Almost surely, 2^76861640 is an apocalyptic number.

It is an amenable number.

76861640 is an abundant number, since it is smaller than the sum of its proper divisors (100102840).

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

76861640 is a wasteful number, since it uses less digits than its factorization.

76861640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44741 (or 44737 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 76861640 is about 8767.0770499637. The cubic root of 76861640 is about 425.1771164888.

The spelling of 76861640 in words is "seventy-six million, eight hundred sixty-one thousand, six hundred forty".