615040 has 48 divisors (see below), whose sum is σ = 1519290. Its totient is φ = 238080.

The previous prime is 615031. The next prime is 615047. The reversal of 615040 is 40516.

It can be written as a sum of positive squares in only one way, i.e., 553536 + 61504 = 744^2 + 248^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (615047) by changing a digit.

615040 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19825 + ... + 19855.

2⁶¹⁵⁰⁴⁰ 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 615040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759645).

615040 is an abundant number, since it is smaller than the sum of its proper divisors (904250).

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

615040 is an equidigital number, since it uses as much as digits as its factorization.

615040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 615040 is about 784.2448597218. The cubic root of 615040 is about 85.0421935847.

Adding to 615040 its reverse (40516), we get a palindrome (655556).

The spelling of 615040 in words is "six hundred fifteen thousand, forty".