78650786440 has 32 divisors (see below), whose sum is σ = 177446494080. Its totient is φ = 31374585792.

The previous prime is 78650786419. The next prime is 78650786441. The reversal of 78650786440 is 4468705687.

It is not an unprimeable number, because it can be changed into a prime (78650786441) 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, 2664162 + ... + 2693521.

It is an arithmetic number, because the mean of its divisors is an integer number (5545202940).

Almost surely, 2^78650786440 is an apocalyptic number.

It is an amenable number.

78650786440 is an abundant number, since it is smaller than the sum of its proper divisors (98795707640).

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

78650786440 is a wasteful number, since it uses less digits than its factorization.

78650786440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5358061 (or 5358057 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 55.

The spelling of 78650786440 in words is "seventy-eight billion, six hundred fifty million, seven hundred eighty-six thousand, four hundred forty".