142705820 has 72 divisors (see below), whose sum is σ = 326292624. Its totient is φ = 52243968.

The previous prime is 142705763. The next prime is 142705847. The reversal of 142705820 is 28507241.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 628547 + ... + 628773.

It is an arithmetic number, because the mean of its divisors is an integer number (4531842).

Almost surely, 2^142705820 is an apocalyptic number.

142705820 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 142705820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163146312).

142705820 is an abundant number, since it is smaller than the sum of its proper divisors (183586804).

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

142705820 is a wasteful number, since it uses less digits than its factorization.

142705820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 142705820 is about 11945.9541268163. The cubic root of 142705820 is about 522.5733144989.

The spelling of 142705820 in words is "one hundred forty-two million, seven hundred five thousand, eight hundred twenty".