615240 has 48 divisors (see below), whose sum is σ = 2000700. Its totient is φ = 163968.

The previous prime is 615233. The next prime is 615253. The reversal of 615240 is 42516.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 580644 + 34596 = 762^2 + 186^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 495 + ... + 1214.

2⁶¹⁵²⁴⁰ is an apocalyptic number.

615240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

615240 is an abundant number, since it is smaller than the sum of its proper divisors (1385460).

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

615240 is a wasteful number, since it uses less digits than its factorization.

615240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726 (or 1719 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 615240 is about 784.3723605533. The cubic root of 615240 is about 85.0514106521.

Adding to 615240 its reverse (42516), we get a palindrome (657756).

The spelling of 615240 in words is "six hundred fifteen thousand, two hundred forty".