642546438 has 16 divisors (see below), whose sum is σ = 1302697776. Its totient is φ = 211248000.

The previous prime is 642546413. The next prime is 642546439. The reversal of 642546438 is 834645246.

It is a self number, because there is not a number n which added to its sum of digits gives 642546438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642546439) 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, 733063 + ... + 733938.

It is an arithmetic number, because the mean of its divisors is an integer number (81418611).

Almost surely, 2^642546438 is an apocalyptic number.

642546438 is an abundant number, since it is smaller than the sum of its proper divisors (660151338).

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

642546438 is a wasteful number, since it uses less digits than its factorization.

642546438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467079.

The product of its digits is 552960, while the sum is 42.

The square root of 642546438 is about 25348.4997189183. The cubic root of 642546438 is about 862.9153081606.

The spelling of 642546438 in words is "six hundred forty-two million, five hundred forty-six thousand, four hundred thirty-eight".