978090 has 16 divisors (see below), whose sum is σ = 2347488. Its totient is φ = 260816.

The previous prime is 978079. The next prime is 978091. The reversal of 978090 is 90879.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (978091) by changing a digit.

978090 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16272 + ... + 16331.

It is an arithmetic number, because the mean of its divisors is an integer number (146718).

2⁹⁷⁸⁰⁹⁰ is an apocalyptic number.

978090 is an abundant number, since it is smaller than the sum of its proper divisors (1369398).

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

978090 is a wasteful number, since it uses less digits than its factorization.

978090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32613.

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

The square root of 978090 is about 988.9843274795. The cubic root of 978090 is about 99.2642669100.

It can be divided in two parts, 9780 and 90, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 978090 in words is "nine hundred seventy-eight thousand, ninety".