142724778 has 16 divisors (see below), whose sum is σ = 326228160. Its totient is φ = 40778496.

The previous prime is 142724773. The next prime is 142724801. The reversal of 142724778 is 877427241.

142724778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 3398209 = 142724778 / (1 + 4 + 2 + 7 + 2 + 4 + 7 + 7 + 8).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (142724773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1699063 + ... + 1699146.

It is an arithmetic number, because the mean of its divisors is an integer number (20389260).

Almost surely, 2^142724778 is an apocalyptic number.

142724778 is an abundant number, since it is smaller than the sum of its proper divisors (183503382).

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

142724778 is a wasteful number, since it uses less digits than its factorization.

142724778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398221.

The product of its digits is 175616, while the sum is 42.

The square root of 142724778 is about 11946.7475908718. The cubic root of 142724778 is about 522.5964541911.

The spelling of 142724778 in words is "one hundred forty-two million, seven hundred twenty-four thousand, seven hundred seventy-eight".