64881438 has 16 divisors (see below), whose sum is σ = 129841920. Its totient is φ = 21613976.

The previous prime is 64881437. The next prime is 64881463. The reversal of 64881438 is 83418846.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64881438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64881431) 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, 16981 + ... + 20447.

It is an arithmetic number, because the mean of its divisors is an integer number (8115120).

Almost surely, 2^64881438 is an apocalyptic number.

64881438 is an abundant number, since it is smaller than the sum of its proper divisors (64960482).

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

64881438 is a wasteful number, since it uses less digits than its factorization.

64881438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6591.

The product of its digits is 147456, while the sum is 42.

The square root of 64881438 is about 8054.9014891555. The cubic root of 64881438 is about 401.8279628214.

The spelling of 64881438 in words is "sixty-four million, eight hundred eighty-one thousand, four hundred thirty-eight".