820622736 has 30 divisors (see below), whose sum is σ = 2296604310. Its totient is φ = 273540864.

The previous prime is 820622717. The next prime is 820622771. The reversal of 820622736 is 637226028.

820622736 is a `hidden beast` number, since 8 + 20 + 622 + 7 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 737448336 + 83174400 = 27156^2 + 9120^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 820622736.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2849241 + ... + 2849528.

It is an arithmetic number, because the mean of its divisors is an integer number (76553477).

Almost surely, 2^820622736 is an apocalyptic number.

It is an amenable number.

820622736 is an abundant number, since it is smaller than the sum of its proper divisors (1475981574).

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

820622736 is a wasteful number, since it uses less digits than its factorization.

820622736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5698783 (or 5698774 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 820622736 is about 28646.5135051371. The cubic root of 820622736 is about 936.2270433224.

The spelling of 820622736 in words is "eight hundred twenty million, six hundred twenty-two thousand, seven hundred thirty-six".