142777728 has 160 divisors (see below), whose sum is σ = 435425760. Its totient is φ = 46420992.

The previous prime is 142777717. The next prime is 142777753. The reversal of 142777728 is 827777241.

It is a super-2 number, since 2×142777728² = 40770959225683968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 487150 + ... + 487442.

It is an arithmetic number, because the mean of its divisors is an integer number (2721411).

Almost surely, 2^142777728 is an apocalyptic number.

142777728 is a gapful number since it is divisible by the number (18) 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 142777728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217712880).

142777728 is an abundant number, since it is smaller than the sum of its proper divisors (292648032).

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

142777728 is an equidigital number, since it uses as much as digits as its factorization.

142777728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 345 counting only the distinct ones).

The product of its digits is 307328, while the sum is 45.

The square root of 142777728 is about 11948.9634696906. The cubic root of 142777728 is about 522.6610728727.

The spelling of 142777728 in words is "one hundred forty-two million, seven hundred seventy-seven thousand, seven hundred twenty-eight".