1642844400 has 240 divisors, whose sum is σ = 5461924224. Its totient is φ = 421770240.

The previous prime is 1642844393. The next prime is 1642844431. The reversal of 1642844400 is 44482461.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×1642844400² = 5397875445222720000, 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 47 ways as a sum of consecutive naturals, for example, 7237087 + ... + 7237313.

Almost surely, 2^1642844400 is an apocalyptic number.

1642844400 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 1642844400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2730962112).

1642844400 is an abundant number, since it is smaller than the sum of its proper divisors (3819079824).

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

1642844400 is a wasteful number, since it uses less digits than its factorization.

1642844400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 33.

The square root of 1642844400 is about 40532.0169742390. The cubic root of 1642844400 is about 1179.9550878243.

The spelling of 1642844400 in words is "one billion, six hundred forty-two million, eight hundred forty-four thousand, four hundred".