142623666 has 80 divisors (see below), whose sum is σ = 332057880. Its totient is φ = 45722880.

The previous prime is 142623661. The next prime is 142623683. The reversal of 142623666 is 666326241.

It can be written as a sum of positive squares in 4 ways, for example, as 133749225 + 8874441 = 11565^2 + 2979^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 142623666.

It is not an unprimeable number, because it can be changed into a prime (142623661) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 723880 + ... + 724076.

Almost surely, 2^142623666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142623666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166028940).

142623666 is an abundant number, since it is smaller than the sum of its proper divisors (189434214).

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

142623666 is a wasteful number, since it uses less digits than its factorization.

142623666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 352 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 142623666 is about 11942.5150617447. The cubic root of 142623666 is about 522.4730155551.

The spelling of 142623666 in words is "one hundred forty-two million, six hundred twenty-three thousand, six hundred sixty-six".