990078 has 16 divisors (see below), whose sum is σ = 2044416. Its totient is φ = 319320.

The previous prime is 990053. The next prime is 990137. The reversal of 990078 is 870099.

It is a congruent number.

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, 2476 + ... + 2847.

It is an arithmetic number, because the mean of its divisors is an integer number (127776).

2⁹⁹⁰⁰⁷⁸ is an apocalyptic number.

990078 is an abundant number, since it is smaller than the sum of its proper divisors (1054338).

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

990078 is a wasteful number, since it uses less digits than its factorization.

990078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5359.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 990078 is about 995.0266328094. The cubic root of 990078 is about 99.6681667516.

The spelling of 990078 in words is "nine hundred ninety thousand, seventy-eight".