78473890 has 16 divisors (see below), whose sum is σ = 154094400. Its totient is φ = 28535920.

The previous prime is 78473851. The next prime is 78473891. The reversal of 78473890 is 9837487.

It is a self number, because there is not a number n which added to its sum of digits gives 78473890.

It is not an unprimeable number, because it can be changed into a prime (78473891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356590 + ... + 356809.

It is an arithmetic number, because the mean of its divisors is an integer number (9630900).

Almost surely, 2^78473890 is an apocalyptic number.

78473890 is a deficient number, since it is larger than the sum of its proper divisors (75620510).

78473890 is a wasteful number, since it uses less digits than its factorization.

78473890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713417.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 78473890 is about 8858.5489782469. The cubic root of 78473890 is about 428.1294081277.

The spelling of 78473890 in words is "seventy-eight million, four hundred seventy-three thousand, eight hundred ninety".