78781870 has 16 divisors (see below), whose sum is σ = 144825408. Its totient is φ = 30842080.

The previous prime is 78781867. The next prime is 78781873. The reversal of 78781870 is 7818787.

It is an interprime number because it is at equal distance from previous prime (78781867) and next prime (78781873).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 78781870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78781873) 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, 83341 + ... + 84280.

It is an arithmetic number, because the mean of its divisors is an integer number (9051588).

Almost surely, 2^78781870 is an apocalyptic number.

78781870 is a deficient number, since it is larger than the sum of its proper divisors (66043538).

78781870 is a wasteful number, since it uses less digits than its factorization.

78781870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167675.

The product of its (nonzero) digits is 175616, while the sum is 46.

The square root of 78781870 is about 8875.9151640831. The cubic root of 78781870 is about 428.6887584048.

The spelling of 78781870 in words is "seventy-eight million, seven hundred eighty-one thousand, eight hundred seventy".