78687742 has 16 divisors (see below), whose sum is σ = 135048672. Its totient is φ = 33684480.

The previous prime is 78687727. The next prime is 78687751. The reversal of 78687742 is 24778687.

It is a happy number.

It is a nialpdrome in base 14.

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, 11742 + ... + 17182.

It is an arithmetic number, because the mean of its divisors is an integer number (8440542).

Almost surely, 2^78687742 is an apocalyptic number.

78687742 is a deficient number, since it is larger than the sum of its proper divisors (56360930).

78687742 is a wasteful number, since it uses less digits than its factorization.

78687742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6483.

The product of its digits is 1053696, while the sum is 49.

The square root of 78687742 is about 8870.6111401639. The cubic root of 78687742 is about 428.5179589695.

The spelling of 78687742 in words is "seventy-eight million, six hundred eighty-seven thousand, seven hundred forty-two".