64687788 has 96 divisors (see below), whose sum is σ = 193777920. Its totient is φ = 18443520.

The previous prime is 64687783. The next prime is 64687817. The reversal of 64687788 is 88778646.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (64687783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18595 + ... + 21797.

It is an arithmetic number, because the mean of its divisors is an integer number (2018520).

Almost surely, 2^64687788 is an apocalyptic number.

64687788 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64687788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96888960).

64687788 is an abundant number, since it is smaller than the sum of its proper divisors (129090132).

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

64687788 is a wasteful number, since it uses less digits than its factorization.

64687788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244 (or 3236 counting only the distinct ones).

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

The square root of 64687788 is about 8042.8718751451. The cubic root of 64687788 is about 401.4277891482.

The spelling of 64687788 in words is "sixty-four million, six hundred eighty-seven thousand, seven hundred eighty-eight".