998197767 has 36 divisors (see below), whose sum is σ = 1718183376. Its totient is φ = 556476480.

The previous prime is 998197763. The next prime is 998197787. The reversal of 998197767 is 767791899.

It is not a de Polignac number, because 998197767 - 2² = 998197763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998197763) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9523 + ... + 45684.

It is an arithmetic number, because the mean of its divisors is an integer number (47727316).

Almost surely, 2^998197767 is an apocalyptic number.

998197767 is a deficient number, since it is larger than the sum of its proper divisors (719985609).

998197767 is a wasteful number, since it uses less digits than its factorization.

998197767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55268 (or 55258 counting only the distinct ones).

The product of its digits is 12002256, while the sum is 63.

The square root of 998197767 is about 31594.2679453093. The cubic root of 998197767 is about 999.3988944111.

It can be divided in two parts, 998 and 197767, that added together give a triangular number (198765 = T₆₃₀).

The spelling of 998197767 in words is "nine hundred ninety-eight million, one hundred ninety-seven thousand, seven hundred sixty-seven".