1604554240 has 80 divisors (see below), whose sum is σ = 3870475488. Its totient is φ = 637935616.

The previous prime is 1604554213. The next prime is 1604554241. The reversal of 1604554240 is 424554061.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604554241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441069 + ... + 444691.

Almost surely, 2^1604554240 is an apocalyptic number.

1604554240 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 1604554240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1935237744).

1604554240 is an abundant number, since it is smaller than the sum of its proper divisors (2265921248).

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

1604554240 is an equidigital number, since it uses as much as digits as its factorization.

1604554240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819 (or 3803 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 1604554240 is about 40056.8875475866. The cubic root of 1604554240 is about 1170.7157672536.

The spelling of 1604554240 in words is "one billion, six hundred four million, five hundred fifty-four thousand, two hundred forty".