78941890 has 16 divisors (see below), whose sum is σ = 142197120. Its totient is φ = 31554160.

The previous prime is 78941887. The next prime is 78941917. The reversal of 78941890 is 9814987.

It is a happy number.

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 78941890.

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, 23751 + ... + 26869.

It is an arithmetic number, because the mean of its divisors is an integer number (8887320).

Almost surely, 2^78941890 is an apocalyptic number.

78941890 is a deficient number, since it is larger than the sum of its proper divisors (63255230).

78941890 is a wasteful number, since it uses less digits than its factorization.

78941890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5657.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 78941890 is about 8884.9248730645. The cubic root of 78941890 is about 428.9788098343.

The spelling of 78941890 in words is "seventy-eight million, nine hundred forty-one thousand, eight hundred ninety".