845784628 has 54 divisors (see below), whose sum is σ = 1653391026. Its totient is φ = 376327296.

The previous prime is 845784619. The next prime is 845784637. The reversal of 845784628 is 826487548.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (845784619) and next prime (845784637).

It can be written as a sum of positive squares in 9 ways, for example, as 4088484 + 841696144 = 2022^2 + 29012^2 .

It is a super-2 number, since 2×845784628² = 1430703273922196768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7759438 + ... + 7759546.

Almost surely, 2^845784628 is an apocalyptic number.

It is an amenable number.

845784628 is a deficient number, since it is larger than the sum of its proper divisors (807606398).

845784628 is a wasteful number, since it uses less digits than its factorization.

845784628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 161 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 52.

The square root of 845784628 is about 29082.3765878925. The cubic root of 845784628 is about 945.6997245693.

Multiplying 845784628 by its sum of digits (52), we get a square (43980800656 = 209716²).

845784628 divided by its sum of digits (52) gives a square (16265089 = 4033²).

The spelling of 845784628 in words is "eight hundred forty-five million, seven hundred eighty-four thousand, six hundred twenty-eight".