1641403764 has 432 divisors, whose sum is σ = 5904714816. Its totient is φ = 391910400.

The previous prime is 1641403747. The next prime is 1641403781. The reversal of 1641403764 is 4673041461.

1641403764 is a `hidden beast` number, since 1 + 641 + 4 + 0 + 3 + 7 + 6 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1641403747) and next prime (1641403781).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 6810684 + ... + 6810924.

Almost surely, 2^1641403764 is an apocalyptic number.

1641403764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641403764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2952357408).

1641403764 is an abundant number, since it is smaller than the sum of its proper divisors (4263311052).

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

1641403764 is a wasteful number, since it uses less digits than its factorization.

1641403764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 1641403764 is about 40514.2414960468. The cubic root of 1641403764 is about 1179.6100799210.

The spelling of 1641403764 in words is "one billion, six hundred forty-one million, four hundred three thousand, seven hundred sixty-four".