1664867634 has 16 divisors (see below), whose sum is σ = 3330135072. Its totient is φ = 554889248.

The previous prime is 1664867623. The next prime is 1664867639. The reversal of 1664867634 is 4367684661.

It is not an unprimeable number, because it can be changed into a prime (1664867639) 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, 90937 + ... + 107699.

It is an arithmetic number, because the mean of its divisors is an integer number (208133442).

Almost surely, 2^1664867634 is an apocalyptic number.

1664867634 is an abundant number, since it is smaller than the sum of its proper divisors (1665267438).

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

1664867634 is a wasteful number, since it uses less digits than its factorization.

1664867634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33321.

The product of its digits is 3483648, while the sum is 51.

The square root of 1664867634 is about 40802.7895369912. The cubic root of 1664867634 is about 1185.2043500955.

The spelling of 1664867634 in words is "one billion, six hundred sixty-four million, eight hundred sixty-seven thousand, six hundred thirty-four".