142646781 has 16 divisors (see below), whose sum is σ = 196173824. Its totient is φ = 92144304.

The previous prime is 142646773. The next prime is 142646783. The reversal of 142646781 is 187646241.

142646781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 142646781 - 2³ = 142646773 is a prime.

It is a super-2 number, since 2×142646781² = 40696208259323922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142646783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12030 + ... + 20736.

It is an arithmetic number, because the mean of its divisors is an integer number (12260864).

Almost surely, 2^142646781 is an apocalyptic number.

It is an amenable number.

142646781 is a deficient number, since it is larger than the sum of its proper divisors (53527043).

142646781 is a wasteful number, since it uses less digits than its factorization.

142646781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8880.

The product of its digits is 64512, while the sum is 39.

The square root of 142646781 is about 11943.4827835100. The cubic root of 142646781 is about 522.5012397428.

The spelling of 142646781 in words is "one hundred forty-two million, six hundred forty-six thousand, seven hundred eighty-one".