1664847404 has 24 divisors (see below), whose sum is σ = 3192243600. Its totient is φ = 753439680.

The previous prime is 1664847403. The next prime is 1664847407. The reversal of 1664847404 is 4047484661.

It is a super-3 number, since 3×1664847404³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (1664847403) 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, 72539 + ... + 92690.

It is an arithmetic number, because the mean of its divisors is an integer number (133010150).

Almost surely, 2^1664847404 is an apocalyptic number.

It is an amenable number.

1664847404 is a deficient number, since it is larger than the sum of its proper divisors (1527396196).

1664847404 is a wasteful number, since it uses less digits than its factorization.

1664847404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165473 (or 165471 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 44.

The square root of 1664847404 is about 40802.5416365206. The cubic root of 1664847404 is about 1185.1995495574.

The spelling of 1664847404 in words is "one billion, six hundred sixty-four million, eight hundred forty-seven thousand, four hundred four".