1642135478 has 8 divisors (see below), whose sum is σ = 2463645240. Its totient is φ = 820920400.

The previous prime is 1642135459. The next prime is 1642135483. The reversal of 1642135478 is 8745312461.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59168 + ... + 82371.

It is an arithmetic number, because the mean of its divisors is an integer number (307955655).

Almost surely, 2^1642135478 is an apocalyptic number.

1642135478 is a deficient number, since it is larger than the sum of its proper divisors (821509762).

1642135478 is a wasteful number, since it uses less digits than its factorization.

1642135478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147342.

The product of its digits is 161280, while the sum is 41.

The square root of 1642135478 is about 40523.2708206038. The cubic root of 1642135478 is about 1179.7853382380.

The spelling of 1642135478 in words is "one billion, six hundred forty-two million, one hundred thirty-five thousand, four hundred seventy-eight".