1604857240 has 128 divisors (see below), whose sum is σ = 4284685440. Its totient is φ = 529514496.

The previous prime is 1604857201. The next prime is 1604857291. The reversal of 1604857240 is 427584061.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 1604857240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1004122 + ... + 1005718.

It is an arithmetic number, because the mean of its divisors is an integer number (33474105).

Almost surely, 2^1604857240 is an apocalyptic number.

1604857240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1604857240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2142342720).

1604857240 is an abundant number, since it is smaller than the sum of its proper divisors (2679828200).

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

1604857240 is a wasteful number, since it uses less digits than its factorization.

1604857240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749 (or 1745 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 1604857240 is about 40060.6694901620. The cubic root of 1604857240 is about 1170.7894542923.

The spelling of 1604857240 in words is "one billion, six hundred four million, eight hundred fifty-seven thousand, two hundred forty".