822647745 has 20 divisors (see below), whose sum is σ = 1474672980. Its totient is φ = 438745248.

The previous prime is 822647723. The next prime is 822647753. The reversal of 822647745 is 547746228.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 362673936 + 459973809 = 19044^2 + 21447^2 .

It is not a de Polignac number, because 822647745 - 2⁶ = 822647681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 822647745.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1015210 + ... + 1016019.

It is an arithmetic number, because the mean of its divisors is an integer number (73733649).

Almost surely, 2^822647745 is an apocalyptic number.

It is an amenable number.

822647745 is a deficient number, since it is larger than the sum of its proper divisors (652025235).

822647745 is a wasteful number, since it uses less digits than its factorization.

822647745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031246 (or 2031237 counting only the distinct ones).

The product of its digits is 752640, while the sum is 45.

The square root of 822647745 is about 28681.8364997780. The cubic root of 822647745 is about 936.9965040397.

It can be divided in two parts, 82264 and 7745, that added together give a palindrome (90009).

The spelling of 822647745 in words is "eight hundred twenty-two million, six hundred forty-seven thousand, seven hundred forty-five".