1641652890 has 32 divisors (see below), whose sum is σ = 3944790720. Its totient is φ = 437238144.

The previous prime is 1641652871. The next prime is 1641652891. The reversal of 1641652890 is 982561461.

It is a super-2 number, since 2×1641652890² = 5390048422490704200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1641652891) 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, 8275 + ... + 57894.

It is an arithmetic number, because the mean of its divisors is an integer number (123274710).

Almost surely, 2^1641652890 is an apocalyptic number.

1641652890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1641652890 is an abundant number, since it is smaller than the sum of its proper divisors (2303137830).

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

1641652890 is a wasteful number, since it uses less digits than its factorization.

1641652890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67006.

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 1641652890 is about 40517.3159278845. The cubic root of 1641652890 is about 1179.6697558075.

The spelling of 1641652890 in words is "one billion, six hundred forty-one million, six hundred fifty-two thousand, eight hundred ninety".