78647742 has 24 divisors (see below), whose sum is σ = 170614080. Its totient is φ = 26183520.

The previous prime is 78647687. The next prime is 78647743. The reversal of 78647742 is 24774687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78647743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15634 + ... + 20042.

It is an arithmetic number, because the mean of its divisors is an integer number (7108920).

Almost surely, 2^78647742 is an apocalyptic number.

78647742 is an abundant number, since it is smaller than the sum of its proper divisors (91966338).

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

78647742 is a wasteful number, since it uses less digits than its factorization.

78647742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408 (or 5405 counting only the distinct ones).

The product of its digits is 526848, while the sum is 45.

The square root of 78647742 is about 8868.3562174735. The cubic root of 78647742 is about 428.4453359528.

The spelling of 78647742 in words is "seventy-eight million, six hundred forty-seven thousand, seven hundred forty-two".