64909776 has 80 divisors (see below), whose sum is σ = 178480640. Its totient is φ = 20269440.

The previous prime is 64909763. The next prime is 64909777. The reversal of 64909776 is 67790946.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64909777) 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, 93591 + ... + 94281.

It is an arithmetic number, because the mean of its divisors is an integer number (2231008).

Almost surely, 2^64909776 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 64909776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89240320).

64909776 is an abundant number, since it is smaller than the sum of its proper divisors (113570864).

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

64909776 is a wasteful number, since it uses less digits than its factorization.

64909776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 64909776 is about 8056.6603502940. The cubic root of 64909776 is about 401.8864558909.

The spelling of 64909776 in words is "sixty-four million, nine hundred nine thousand, seven hundred seventy-six".