642020094 has 80 divisors (see below), whose sum is σ = 1479506688. Its totient is φ = 208849752.

The previous prime is 642020081. The next prime is 642020117. The reversal of 642020094 is 490020246.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1850029 + ... + 1850375.

Almost surely, 2^642020094 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642020094, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (739753344).

642020094 is an abundant number, since it is smaller than the sum of its proper divisors (837486594).

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

642020094 is an frugal number, since it uses more digits than its factorization.

642020094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 642020094 is about 25338.1154389982. The cubic root of 642020094 is about 862.6796238367.

The spelling of 642020094 in words is "six hundred forty-two million, twenty thousand, ninety-four".