978726998 has 4 divisors (see below), whose sum is σ = 1468090500. Its totient is φ = 489363498.

The previous prime is 978726979. The next prime is 978727019. The reversal of 978726998 is 899627879.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×978726998² = 1915813073228184008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 244681748 + ... + 244681751.

It is an arithmetic number, because the mean of its divisors is an integer number (367022625).

Almost surely, 2^978726998 is an apocalyptic number.

978726998 is a deficient number, since it is larger than the sum of its proper divisors (489363502).

978726998 is a wasteful number, since it uses less digits than its factorization.

978726998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489363501.

The product of its digits is 27433728, while the sum is 65.

The square root of 978726998 is about 31284.6127992660. The cubic root of 978726998 is about 992.8581142286.

The spelling of 978726998 in words is "nine hundred seventy-eight million, seven hundred twenty-six thousand, nine hundred ninety-eight".