822574988978 has 6 divisors (see below), whose sum is σ = 1233864407421. Its totient is φ = 411286853172.

The previous prime is 822574988957. The next prime is 822574988981. The reversal of 822574988978 is 879889475228.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 520962037729 + 301612951249 = 721777^2 + 549193^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=641317.

It is a super-2 number, since 2×822574988978² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 822574988899 and 822574988908.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 961976 + ... + 1603292.

Almost surely, 2^822574988978 is an apocalyptic number.

822574988978 is a deficient number, since it is larger than the sum of its proper divisors (411289418443).

822574988978 is an frugal number, since it uses more digits than its factorization.

822574988978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282636 (or 641319 counting only the distinct ones).

The product of its digits is 1300561920, while the sum is 77.

The spelling of 822574988978 in words is "eight hundred twenty-two billion, five hundred seventy-four million, nine hundred eighty-eight thousand, nine hundred seventy-eight".