820003788 has 36 divisors (see below), whose sum is σ = 2074891728. Its totient is φ = 273057120.

The previous prime is 820003741. The next prime is 820003837. The reversal of 820003788 is 887300028.

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 (36).

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, 26070 + ... + 48162.

Almost surely, 2^820003788 is an apocalyptic number.

It is an amenable number.

820003788 is an abundant number, since it is smaller than the sum of its proper divisors (1254887940).

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

820003788 is a wasteful number, since it uses less digits than its factorization.

820003788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23134 (or 23129 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 820003788 is about 28635.7082678253. The cubic root of 820003788 is about 935.9916035846.

The spelling of 820003788 in words is "eight hundred twenty million, three thousand, seven hundred eighty-eight".