64641776 has 40 divisors (see below), whose sum is σ = 131375520. Its totient is φ = 30753536.

The previous prime is 64641697. The next prime is 64641793. The reversal of 64641776 is 67714646.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98666 + ... + 99318.

It is an arithmetic number, because the mean of its divisors is an integer number (3284388).

Almost surely, 2^64641776 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 64641776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65687760).

64641776 is an abundant number, since it is smaller than the sum of its proper divisors (66733744).

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

64641776 is a wasteful number, since it uses less digits than its factorization.

64641776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953 (or 947 counting only the distinct ones).

The product of its digits is 169344, while the sum is 41.

The square root of 64641776 is about 8040.0109452662. The cubic root of 64641776 is about 401.3325889203.

The spelling of 64641776 in words is "sixty-four million, six hundred forty-one thousand, seven hundred seventy-six".