1641363640 has 64 divisors (see below), whose sum is σ = 4442803200. Its totient is φ = 533132928.

The previous prime is 1641363637. The next prime is 1641363641. The reversal of 1641363640 is 463631461.

It is a junction number, because it is equal to n+sod(n) for n = 1641363596 and 1641363605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641363641) 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, 148944 + ... + 159583.

It is an arithmetic number, because the mean of its divisors is an integer number (69418800).

Almost surely, 2^1641363640 is an apocalyptic number.

1641363640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641363640 is an abundant number, since it is smaller than the sum of its proper divisors (2801439560).

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

1641363640 is a wasteful number, since it uses less digits than its factorization.

1641363640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308564 (or 308560 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 1641363640 is about 40513.7463091233. The cubic root of 1641363640 is about 1179.6004680141.

The spelling of 1641363640 in words is "one billion, six hundred forty-one million, three hundred sixty-three thousand, six hundred forty".