64677888 has 216 divisors, whose sum is σ = 212407650. Its totient is φ = 18923520.

The previous prime is 64677871. The next prime is 64677889. The reversal of 64677888 is 88877646.

It can be written as a sum of positive squares in only one way, i.e., 54641664 + 10036224 = 7392^2 + 3168^2 .

It is a super-2 number, since 2×64677888² = 8366458392281088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64677889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2230258 + ... + 2230286.

Almost surely, 2^64677888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64677888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106203825).

64677888 is an abundant number, since it is smaller than the sum of its proper divisors (147729762).

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

64677888 is a wasteful number, since it uses less digits than its factorization.

64677888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 45 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The square root of 64677888 is about 8042.2563997923. The cubic root of 64677888 is about 401.4073095595.

The spelling of 64677888 in words is "sixty-four million, six hundred seventy-seven thousand, eight hundred eighty-eight".