64723240 has 16 divisors (see below), whose sum is σ = 145627380. Its totient is φ = 25889280.

The previous prime is 64723237. The next prime is 64723261. The reversal of 64723240 is 4232746.

It can be written as a sum of positive squares in 2 ways, for example, as 64545156 + 178084 = 8034^2 + 422^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64723199 and 64723208.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809001 + ... + 809080.

Almost surely, 2^64723240 is an apocalyptic number.

It is an amenable number.

64723240 is an abundant number, since it is smaller than the sum of its proper divisors (80904140).

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

64723240 is a wasteful number, since it uses less digits than its factorization.

64723240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618092 (or 1618088 counting only the distinct ones).

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

The square root of 64723240 is about 8045.0755123864. The cubic root of 64723240 is about 401.5011096278.

Adding to 64723240 its reverse (4232746), we get a palindrome (68955986).

The spelling of 64723240 in words is "sixty-four million, seven hundred twenty-three thousand, two hundred forty".