978240990 has 32 divisors (see below), whose sum is σ = 2354099616. Its totient is φ = 260161920.

The previous prime is 978240941. The next prime is 978241003. The reversal of 978240990 is 99042879.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32521 + ... + 54900.

It is an arithmetic number, because the mean of its divisors is an integer number (73565613).

Almost surely, 2^978240990 is an apocalyptic number.

978240990 is an abundant number, since it is smaller than the sum of its proper divisors (1375858626).

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

978240990 is a wasteful number, since it uses less digits than its factorization.

978240990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87804.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 978240990 is about 31276.8443101282. The cubic root of 978240990 is about 992.6937453151.

The spelling of 978240990 in words is "nine hundred seventy-eight million, two hundred forty thousand, nine hundred ninety".