820899538 has 8 divisors (see below), whose sum is σ = 1264629132. Its totient is φ = 399356496.

The previous prime is 820899523. The next prime is 820899539. The reversal of 820899538 is 835998028.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 807525889 + 13373649 = 28417^2 + 3657^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×820899538² = 1347752102977226888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (820899539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5546545 + ... + 5546692.

Almost surely, 2^820899538 is an apocalyptic number.

820899538 is a deficient number, since it is larger than the sum of its proper divisors (443729594).

820899538 is a wasteful number, since it uses less digits than its factorization.

820899538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11093276.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The square root of 820899538 is about 28651.3444361691. The cubic root of 820899538 is about 936.3322968794.

The spelling of 820899538 in words is "eight hundred twenty million, eight hundred ninety-nine thousand, five hundred thirty-eight".