64881895 has 16 divisors (see below), whose sum is σ = 84686112. Its totient is φ = 47433600.

The previous prime is 64881893. The next prime is 64881899. The reversal of 64881895 is 59818846.

It is not a de Polignac number, because 64881895 - 2¹ = 64881893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64881893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1624 + ... + 11506.

It is an arithmetic number, because the mean of its divisors is an integer number (5292882).

Almost surely, 2^64881895 is an apocalyptic number.

64881895 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64881895 is a deficient number, since it is larger than the sum of its proper divisors (19804217).

64881895 is a wasteful number, since it uses less digits than its factorization.

64881895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10002.

The product of its digits is 552960, while the sum is 49.

The square root of 64881895 is about 8054.9298569261. The cubic root of 64881895 is about 401.8289062599.

The spelling of 64881895 in words is "sixty-four million, eight hundred eighty-one thousand, eight hundred ninety-five".