1604509990 has 32 divisors (see below), whose sum is σ = 2968249536. Its totient is φ = 624099840.

The previous prime is 1604509957. The next prime is 1604509993. The reversal of 1604509990 is 999054061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604509993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122079 + ... + 134581.

It is an arithmetic number, because the mean of its divisors is an integer number (92757798).

Almost surely, 2^1604509990 is an apocalyptic number.

1604509990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1604509990 is a deficient number, since it is larger than the sum of its proper divisors (1363739546).

1604509990 is a wasteful number, since it uses less digits than its factorization.

1604509990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12864.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 1604509990 is about 40056.3352043094. The cubic root of 1604509990 is about 1170.7050052514.

The spelling of 1604509990 in words is "one billion, six hundred four million, five hundred nine thousand, nine hundred ninety".