820998972 has 36 divisors (see below), whose sum is σ = 2106283816. Its totient is φ = 269580960.

The previous prime is 820998967. The next prime is 820998989. The reversal of 820998972 is 279899028.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 167779 + ... + 172602.

Almost surely, 2^820998972 is an apocalyptic number.

It is an amenable number.

820998972 is an abundant number, since it is smaller than the sum of its proper divisors (1285284844).

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

820998972 is a wasteful number, since it uses less digits than its factorization.

820998972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340458 (or 340453 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 820998972 is about 28653.0796250595. The cubic root of 820998972 is about 936.3701007366.

The spelling of 820998972 in words is "eight hundred twenty million, nine hundred ninety-eight thousand, nine hundred seventy-two".