642774403 has 8 divisors (see below), whose sum is σ = 687324960. Its totient is φ = 598972800.

The previous prime is 642774347. The next prime is 642774409. The reversal of 642774403 is 304477246.

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

It is a cyclic number.

It is not a de Polignac number, because 642774403 - 2²⁹ = 105903491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642774409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185463 + ... + 188896.

It is an arithmetic number, because the mean of its divisors is an integer number (85915620).

Almost surely, 2^642774403 is an apocalyptic number.

642774403 is a deficient number, since it is larger than the sum of its proper divisors (44550557).

642774403 is a wasteful number, since it uses less digits than its factorization.

642774403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374477.

The product of its (nonzero) digits is 112896, while the sum is 37.

The square root of 642774403 is about 25352.9959373641. The cubic root of 642774403 is about 863.0173455219.

The spelling of 642774403 in words is "six hundred forty-two million, seven hundred seventy-four thousand, four hundred three".