78728706 has 32 divisors (see below), whose sum is σ = 199946880. Its totient is φ = 22493808.

The previous prime is 78728693. The next prime is 78728719. The reversal of 78728706 is 60782787.

It is an interprime number because it is at equal distance from previous prime (78728693) and next prime (78728719).

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103761 + ... + 104516.

It is an arithmetic number, because the mean of its divisors is an integer number (6248340).

Almost surely, 2^78728706 is an apocalyptic number.

78728706 is an abundant number, since it is smaller than the sum of its proper divisors (121218174).

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

78728706 is a wasteful number, since it uses less digits than its factorization.

78728706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208295 (or 208289 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 78728706 is about 8872.9198125532. The cubic root of 78728706 is about 428.5923066972.

The spelling of 78728706 in words is "seventy-eight million, seven hundred twenty-eight thousand, seven hundred six".