642825993 has 8 divisors (see below), whose sum is σ = 902212000. Its totient is φ = 405995328.

The previous prime is 642825949. The next prime is 642826021. The reversal of 642825993 is 399528246.

It is a happy number.

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

It is not a de Polignac number, because 642825993 - 2¹⁶ = 642760457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642825193) 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, 5638768 + ... + 5638881.

It is an arithmetic number, because the mean of its divisors is an integer number (112776500).

Almost surely, 2^642825993 is an apocalyptic number.

It is an amenable number.

642825993 is a deficient number, since it is larger than the sum of its proper divisors (259386007).

642825993 is a wasteful number, since it uses less digits than its factorization.

642825993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11277671.

The product of its digits is 933120, while the sum is 48.

The square root of 642825993 is about 25354.0133509470. The cubic root of 642825993 is about 863.0404339096.

The spelling of 642825993 in words is "six hundred forty-two million, eight hundred twenty-five thousand, nine hundred ninety-three".