142640000 has 80 divisors (see below), whose sum is σ = 355292520. Its totient is φ = 57024000.

The previous prime is 142639969. The next prime is 142640027. The reversal of 142640000 is 46241.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 79109 + ... + 80891.

Almost surely, 2^142640000 is an apocalyptic number.

142640000 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 142640000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177646260).

142640000 is an abundant number, since it is smaller than the sum of its proper divisors (212652520).

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

142640000 is an frugal number, since it uses more digits than its factorization.

142640000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817 (or 1790 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 142640000 is about 11943.1989014669. The cubic root of 142640000 is about 522.4929602312.

Adding to 142640000 its reverse (46241), we get a palindrome (142686241).

The spelling of 142640000 in words is "one hundred forty-two million, six hundred forty thousand".