142778506 has 8 divisors (see below), whose sum is σ = 230642244. Its totient is φ = 65897760.

The previous prime is 142778479. The next prime is 142778507. The reversal of 142778506 is 605877241.

It can be written as a sum of positive squares in 2 ways, for example, as 142683025 + 95481 = 11945^2 + 309^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (142778507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2745715 + ... + 2745766.

Almost surely, 2^142778506 is an apocalyptic number.

142778506 is a deficient number, since it is larger than the sum of its proper divisors (87863738).

142778506 is a wasteful number, since it uses less digits than its factorization.

142778506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5491496.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 142778506 is about 11948.9960247713. The cubic root of 142778506 is about 522.6620222028.

The spelling of 142778506 in words is "one hundred forty-two million, seven hundred seventy-eight thousand, five hundred six".