64478736 has 120 divisors (see below), whose sum is σ = 210772224. Its totient is φ = 18017280.

The previous prime is 64478731. The next prime is 64478737. The reversal of 64478736 is 63787446.

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

It is a junction number, because it is equal to n+sod(n) for n = 64478691 and 64478700.

It is not an unprimeable number, because it can be changed into a prime (64478731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46696 + ... + 48056.

Almost surely, 2^64478736 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 64478736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105386112).

64478736 is an abundant number, since it is smaller than the sum of its proper divisors (146293488).

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

64478736 is a wasteful number, since it uses less digits than its factorization.

64478736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429 (or 1420 counting only the distinct ones).

The product of its digits is 677376, while the sum is 45.

The square root of 64478736 is about 8029.8652541621. The cubic root of 64478736 is about 400.9948900993.

The spelling of 64478736 in words is "sixty-four million, four hundred seventy-eight thousand, seven hundred thirty-six".