642047554 has 4 divisors (see below), whose sum is σ = 963071334. Its totient is φ = 321023776.

The previous prime is 642047537. The next prime is 642047561. The reversal of 642047554 is 455740246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 441966529 + 200081025 = 21023^2 + 14145^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160511887 + ... + 160511890.

Almost surely, 2^642047554 is an apocalyptic number.

642047554 is a deficient number, since it is larger than the sum of its proper divisors (321023780).

642047554 is a wasteful number, since it uses less digits than its factorization.

642047554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321023779.

The product of its (nonzero) digits is 134400, while the sum is 37.

The square root of 642047554 is about 25338.6573046008. The cubic root of 642047554 is about 862.6919229557.

The spelling of 642047554 in words is "six hundred forty-two million, forty-seven thousand, five hundred fifty-four".