78717970 has 16 divisors (see below), whose sum is σ = 143487360. Its totient is φ = 31088304.

The previous prime is 78717943. The next prime is 78717979. The reversal of 78717970 is 7971787.

It is a super-3 number, since 3×78717970³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78717970.

It is not an unprimeable number, because it can be changed into a prime (78717979) 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, 49032 + ... + 50611.

It is an arithmetic number, because the mean of its divisors is an integer number (8967960).

Almost surely, 2^78717970 is an apocalyptic number.

78717970 is a deficient number, since it is larger than the sum of its proper divisors (64769390).

78717970 is a wasteful number, since it uses less digits than its factorization.

78717970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99729.

The product of its (nonzero) digits is 172872, while the sum is 46.

The square root of 78717970 is about 8872.3148050551. The cubic root of 78717970 is about 428.5728238579.

The spelling of 78717970 in words is "seventy-eight million, seven hundred seventeen thousand, nine hundred seventy".