820783572 has 48 divisors (see below), whose sum is σ = 2219599872. Its totient is φ = 231204960.

The previous prime is 820783547. The next prime is 820783583. The reversal of 820783572 is 275387028.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62848 + ... + 74775.

It is an arithmetic number, because the mean of its divisors is an integer number (46241664).

Almost surely, 2^820783572 is an apocalyptic number.

It is an amenable number.

820783572 is an abundant number, since it is smaller than the sum of its proper divisors (1398816300).

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

820783572 is a wasteful number, since it uses less digits than its factorization.

820783572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137708 (or 137706 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 820783572 is about 28649.3206202172. The cubic root of 820783572 is about 936.2882038572.

The spelling of 820783572 in words is "eight hundred twenty million, seven hundred eighty-three thousand, five hundred seventy-two".