78742986 has 16 divisors (see below), whose sum is σ = 179984064. Its totient is φ = 22497984.

The previous prime is 78742957. The next prime is 78742987. The reversal of 78742986 is 68924787.

It is not an unprimeable number, because it can be changed into a prime (78742987) 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, 937375 + ... + 937458.

It is an arithmetic number, because the mean of its divisors is an integer number (11249004).

Almost surely, 2^78742986 is an apocalyptic number.

78742986 is an abundant number, since it is smaller than the sum of its proper divisors (101241078).

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

78742986 is a wasteful number, since it uses less digits than its factorization.

78742986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874845.

The product of its digits is 1354752, while the sum is 51.

The square root of 78742986 is about 8873.7244717199. The cubic root of 78742986 is about 428.6182181614.

The spelling of 78742986 in words is "seventy-eight million, seven hundred forty-two thousand, nine hundred eighty-six".