998556774 has 16 divisors (see below), whose sum is σ = 1997423280. Its totient is φ = 332800640.

The previous prime is 998556743. The next prime is 998556781. The reversal of 998556774 is 477655899.

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 7 ways as a sum of consecutive naturals, for example, 68794 + ... + 82034.

It is an arithmetic number, because the mean of its divisors is an integer number (124838955).

Almost surely, 2^998556774 is an apocalyptic number.

998556774 is an abundant number, since it is smaller than the sum of its proper divisors (998866506).

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

998556774 is a wasteful number, since it uses less digits than its factorization.

998556774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25815.

The product of its digits is 19051200, while the sum is 60.

The square root of 998556774 is about 31599.9489556550. The cubic root of 998556774 is about 999.5186930475.

The spelling of 998556774 in words is "nine hundred ninety-eight million, five hundred fifty-six thousand, seven hundred seventy-four".