1641457440 has 768 divisors, whose sum is σ = 7245987840. Its totient is φ = 338411520.

The previous prime is 1641457397. The next prime is 1641457463. The reversal of 1641457440 is 447541461.

It is a happy number.

1641457440 is a `hidden beast` number, since 1 + 6 + 41 + 4 + 574 + 40 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1641457395 and 1641457404.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 15936429 + ... + 15936531.

It is an arithmetic number, because the mean of its divisors is an integer number (9434880).

Almost surely, 2^1641457440 is an apocalyptic number.

1641457440 is a gapful number since it is divisible by the number (10) 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 1641457440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3622993920).

1641457440 is an abundant number, since it is smaller than the sum of its proper divisors (5604530400).

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

1641457440 is a wasteful number, since it uses less digits than its factorization.

1641457440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 1641457440 is about 40514.9039243585. The cubic root of 1641457440 is about 1179.6229380330.

The spelling of 1641457440 in words is "one billion, six hundred forty-one million, four hundred fifty-seven thousand, four hundred forty".