1664867190 has 64 divisors (see below), whose sum is σ = 4765049856. Its totient is φ = 363994752.

The previous prime is 1664867179. The next prime is 1664867201. The reversal of 1664867190 is 917684661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1664867179) and next prime (1664867201).

It is a super-2 number, since 2×1664867190² = 5543565520676992200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167517 + ... + 177176.

It is an arithmetic number, because the mean of its divisors is an integer number (74453904).

Almost surely, 2^1664867190 is an apocalyptic number.

1664867190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1664867190 is an abundant number, since it is smaller than the sum of its proper divisors (3100182666).

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

1664867190 is a wasteful number, since it uses less digits than its factorization.

1664867190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344733.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 1664867190 is about 40802.7840961864. The cubic root of 1664867190 is about 1185.2042447356.

It can be divided in two parts, 16648 and 67190, that added together give a palindrome (83838).

The spelling of 1664867190 in words is "one billion, six hundred sixty-four million, eight hundred sixty-seven thousand, one hundred ninety".