1609964478 has 32 divisors (see below), whose sum is σ = 3693112320. Its totient is φ = 519342840.

The previous prime is 1609964459. The next prime is 1609964501. The reversal of 1609964478 is 8744699061.

1609964478 is a `hidden beast` number, since 160 + 9 + 9 + 6 + 4 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479200 + ... + 482547.

It is an arithmetic number, because the mean of its divisors is an integer number (115409760).

Almost surely, 2^1609964478 is an apocalyptic number.

1609964478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1609964478 is an abundant number, since it is smaller than the sum of its proper divisors (2083147842).

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

1609964478 is a wasteful number, since it uses less digits than its factorization.

1609964478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961789 (or 961783 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 1609964478 is about 40124.3626491437. The cubic root of 1609964478 is about 1172.0300981022.

The spelling of 1609964478 in words is "one billion, six hundred nine million, nine hundred sixty-four thousand, four hundred seventy-eight".