867645428 has 24 divisors (see below), whose sum is σ = 1645608552. Its totient is φ = 397897344.

The previous prime is 867645419. The next prime is 867645433. The reversal of 867645428 is 824546768.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 185286544 + 682358884 = 13612^2 + 26122^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44975 + ... + 61302.

It is an arithmetic number, because the mean of its divisors is an integer number (68567023).

Almost surely, 2^867645428 is an apocalyptic number.

It is an amenable number.

867645428 is a deficient number, since it is larger than the sum of its proper divisors (777963124).

867645428 is a wasteful number, since it uses less digits than its factorization.

867645428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106451 (or 106449 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 50.

The square root of 867645428 is about 29455.8216317250. The cubic root of 867645428 is about 953.7782785615.

The spelling of 867645428 in words is "eight hundred sixty-seven million, six hundred forty-five thousand, four hundred twenty-eight".