642274451 has 8 divisors (see below), whose sum is σ = 790491744. Its totient is φ = 508173120.

The previous prime is 642274439. The next prime is 642274469. The reversal of 642274451 is 154472246.

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 642274451 - 2⁶ = 642274387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642274351) 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, 3528890 + ... + 3529071.

It is an arithmetic number, because the mean of its divisors is an integer number (98811468).

Almost surely, 2^642274451 is an apocalyptic number.

642274451 is a deficient number, since it is larger than the sum of its proper divisors (148217293).

642274451 is a wasteful number, since it uses less digits than its factorization.

642274451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7057981.

The product of its digits is 53760, while the sum is 35.

The square root of 642274451 is about 25343.1341984373. The cubic root of 642274451 is about 862.7935349284.

The spelling of 642274451 in words is "six hundred forty-two million, two hundred seventy-four thousand, four hundred fifty-one".