978228890 has 16 divisors (see below), whose sum is σ = 1762525440. Its totient is φ = 390910800.

The previous prime is 978228883. The next prime is 978228929. The reversal of 978228890 is 98822879.

It is a super-2 number, since 2×978228890² = 1913863522461264200, which contains 22 as substring.

It is a Curzon 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, 36686 + ... + 57465.

It is an arithmetic number, because the mean of its divisors is an integer number (110157840).

Almost surely, 2^978228890 is an apocalyptic number.

978228890 is a deficient number, since it is larger than the sum of its proper divisors (784296550).

978228890 is a wasteful number, since it uses less digits than its factorization.

978228890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95197.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 978228890 is about 31276.6508756932. The cubic root of 978228890 is about 992.6896523755.

The spelling of 978228890 in words is "nine hundred seventy-eight million, two hundred twenty-eight thousand, eight hundred ninety".