642027434 has 4 divisors (see below), whose sum is σ = 963041154. Its totient is φ = 321013716.

The previous prime is 642027409. The next prime is 642027469. The reversal of 642027434 is 434720246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434720246 = 2 ⋅217360123.

It can be written as a sum of positive squares in only one way, i.e., 631768225 + 10259209 = 25135^2 + 3203^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642027434.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160506857 + ... + 160506860.

Almost surely, 2^642027434 is an apocalyptic number.

642027434 is a deficient number, since it is larger than the sum of its proper divisors (321013720).

642027434 is a wasteful number, since it uses less digits than its factorization.

642027434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321013719.

The product of its (nonzero) digits is 32256, while the sum is 32.

The square root of 642027434 is about 25338.2602796640. The cubic root of 642027434 is about 862.6829113996.

The spelling of 642027434 in words is "six hundred forty-two million, twenty-seven thousand, four hundred thirty-four".