64438542 has 24 divisors (see below), whose sum is σ = 159562416. Its totient is φ = 18410976.

The previous prime is 64438541. The next prime is 64438573. The reversal of 64438542 is 24583446.

64438542 is a `hidden beast` number, since 644 + 3 + 8 + 5 + 4 + 2 = 666.

64438542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 64438497 and 64438506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64438541) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 255583 + ... + 255834.

It is an arithmetic number, because the mean of its divisors is an integer number (6648434).

Almost surely, 2^64438542 is an apocalyptic number.

64438542 is an abundant number, since it is smaller than the sum of its proper divisors (95123874).

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

64438542 is a wasteful number, since it uses less digits than its factorization.

64438542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511432 (or 511429 counting only the distinct ones).

The product of its digits is 92160, while the sum is 36.

The square root of 64438542 is about 8027.3620822783. The cubic root of 64438542 is about 400.9115502789.

It can be divided in two parts, 64438 and 542, that added together give a triangular number (64980 = T₃₆₀).

The spelling of 64438542 in words is "sixty-four million, four hundred thirty-eight thousand, five hundred forty-two".