1642646544 has 160 divisors (see below), whose sum is σ = 5316993024. Its totient is φ = 424535040.

The previous prime is 1642646531. The next prime is 1642646627. The reversal of 1642646544 is 4456462461.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1642646496 and 1642646505.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 823212 + ... + 825204.

Almost surely, 2^1642646544 is an apocalyptic number.

1642646544 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 1642646544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2658496512).

1642646544 is an abundant number, since it is smaller than the sum of its proper divisors (3674346480).

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

1642646544 is a wasteful number, since it uses less digits than its factorization.

1642646544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245 (or 2239 counting only the distinct ones).

The product of its digits is 552960, while the sum is 42.

The square root of 1642646544 is about 40529.5761635870. The cubic root of 1642646544 is about 1179.9077166172.

The spelling of 1642646544 in words is "one billion, six hundred forty-two million, six hundred forty-six thousand, five hundred forty-four".