642049254 has 336 divisors, whose sum is σ = 1973695680. Its totient is φ = 154314720.

The previous prime is 642049253. The next prime is 642049259. The reversal of 642049254 is 452940246.

642049254 is a `hidden beast` number, since 642 + 0 + 4 + 9 + 2 + 5 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642049253) by changing a digit.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 14931357 + ... + 14931399.

Almost surely, 2^642049254 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642049254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (986847840).

642049254 is an abundant number, since it is smaller than the sum of its proper divisors (1331646426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642049254 is a wasteful number, since it uses less digits than its factorization.

642049254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 642049254 is about 25338.6908501604. The cubic root of 642049254 is about 862.6926843609.

The spelling of 642049254 in words is "six hundred forty-two million, forty-nine thousand, two hundred fifty-four".