826991820 has 36 divisors (see below), whose sum is σ = 2508542400. Its totient is φ = 220531104.

The previous prime is 826991797. The next prime is 826991821. The reversal of 826991820 is 28199628.

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

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (826991821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2297020 + ... + 2297379.

Almost surely, 2^826991820 is an apocalyptic number.

It is an amenable number.

826991820 is an abundant number, since it is smaller than the sum of its proper divisors (1681550580).

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

826991820 is a wasteful number, since it uses less digits than its factorization.

826991820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4594414 (or 4594409 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 826991820 is about 28757.4654655100. The cubic root of 826991820 is about 938.6429111715.

The spelling of 826991820 in words is "eight hundred twenty-six million, nine hundred ninety-one thousand, eight hundred twenty".