820737772 has 12 divisors (see below), whose sum is σ = 1482623296. Its totient is φ = 397131120.

The previous prime is 820737769. The next prime is 820737809. The reversal of 820737772 is 277737028.

It is a super-2 number, since 2×820737772² = 1347220980775047968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3309303 + ... + 3309550.

Almost surely, 2^820737772 is an apocalyptic number.

It is an amenable number.

820737772 is a deficient number, since it is larger than the sum of its proper divisors (661885524).

820737772 is a wasteful number, since it uses less digits than its factorization.

820737772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6618888 (or 6618886 counting only the distinct ones).

The product of its (nonzero) digits is 230496, while the sum is 43.

The square root of 820737772 is about 28648.5212881922. The cubic root of 820737772 is about 936.2707884675.

The spelling of 820737772 in words is "eight hundred twenty million, seven hundred thirty-seven thousand, seven hundred seventy-two".