64732240 has 80 divisors (see below), whose sum is σ = 162846720. Its totient is φ = 23846400.

The previous prime is 64732223. The next prime is 64732249. The reversal of 64732240 is 4223746.

64732240 = T₁₀₂₄ + T₁₀₂₅ + ... + T₁₁₃₄.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 64732199 and 64732208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64732249) 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, 55665 + ... + 56815.

It is an arithmetic number, because the mean of its divisors is an integer number (2035584).

Almost surely, 2^64732240 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 64732240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81423360).

64732240 is an abundant number, since it is smaller than the sum of its proper divisors (98114480).

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

64732240 is a wasteful number, since it uses less digits than its factorization.

64732240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 64732240 is about 8045.6348413286. The cubic root of 64732240 is about 401.5197188245.

Adding to 64732240 its reverse (4223746), we get a palindrome (68955986).

The spelling of 64732240 in words is "sixty-four million, seven hundred thirty-two thousand, two hundred forty".