78490890 has 32 divisors (see below), whose sum is σ = 209309760. Its totient is φ = 20930832.

The previous prime is 78490889. The next prime is 78490901. The reversal of 78490890 is 9809487.

78490890 is a `hidden beast` number, since 78 + 490 + 8 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 145084 + ... + 145623.

It is an arithmetic number, because the mean of its divisors is an integer number (6540930).

Almost surely, 2^78490890 is an apocalyptic number.

78490890 is an abundant number, since it is smaller than the sum of its proper divisors (130818870).

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

78490890 is a wasteful number, since it uses less digits than its factorization.

78490890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290723 (or 290717 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 78490890 is about 8859.5084513758. The cubic root of 78490890 is about 428.1603214860.

The spelling of 78490890 in words is "seventy-eight million, four hundred ninety thousand, eight hundred ninety".