845157640 has 16 divisors (see below), whose sum is σ = 1901604780. Its totient is φ = 338063040.

The previous prime is 845157637. The next prime is 845157653. The reversal of 845157640 is 46751548.

It can be written as a sum of positive squares in 2 ways, for example, as 842973156 + 2184484 = 29034^2 + 1478^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 21128941 = 845157640 / (8 + 4 + 5 + 1 + 5 + 7 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 845157593 and 845157602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10564431 + ... + 10564510.

Almost surely, 2^845157640 is an apocalyptic number.

It is an amenable number.

845157640 is an abundant number, since it is smaller than the sum of its proper divisors (1056447140).

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

845157640 is a wasteful number, since it uses less digits than its factorization.

845157640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21128952 (or 21128948 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 845157640 is about 29071.5950714783. The cubic root of 845157640 is about 945.4659814714.

The spelling of 845157640 in words is "eight hundred forty-five million, one hundred fifty-seven thousand, six hundred forty".