64687896 has 160 divisors (see below), whose sum is σ = 223201440. Its totient is φ = 17044992.

The previous prime is 64687871. The next prime is 64687901. The reversal of 64687896 is 69878646.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 58420 + ... + 59516.

It is an arithmetic number, because the mean of its divisors is an integer number (1395009).

Almost surely, 2^64687896 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 64687896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111600720).

64687896 is an abundant number, since it is smaller than the sum of its proper divisors (158513544).

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

64687896 is a wasteful number, since it uses less digits than its factorization.

64687896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1122 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 64687896 is about 8042.8785891620. The cubic root of 64687896 is about 401.4280125503.

The spelling of 64687896 in words is "sixty-four million, six hundred eighty-seven thousand, eight hundred ninety-six".