1604428740 has 72 divisors (see below), whose sum is σ = 4870914048. Its totient is φ = 427483200.

The previous prime is 1604428739. The next prime is 1604428753. The reversal of 1604428740 is 478244061.

1604428740 is a `hidden beast` number, since 1 + 604 + 4 + 2 + 8 + 7 + 40 = 666.

1604428740 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1604428695 and 1604428704.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 258109 + ... + 264251.

It is an arithmetic number, because the mean of its divisors is an integer number (67651584).

Almost surely, 2^1604428740 is an apocalyptic number.

1604428740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1604428740 is an abundant number, since it is smaller than the sum of its proper divisors (3266485308).

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

1604428740 is a wasteful number, since it uses less digits than its factorization.

1604428740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7609 (or 7604 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The square root of 1604428740 is about 40055.3209948441. The cubic root of 1604428740 is about 1170.6852439976.

The spelling of 1604428740 in words is "one billion, six hundred four million, four hundred twenty-eight thousand, seven hundred forty".