615680 has 72 divisors (see below), whose sum is σ = 1631112. Its totient is φ = 221184.

The previous prime is 615679. The next prime is 615709. The reversal of 615680 is 86516.

It can be written as a sum of positive squares in 4 ways, for example, as 73984 + 541696 = 272^2 + 736^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16622 + ... + 16658.

2⁶¹⁵⁶⁸⁰ 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 615680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815556).

615680 is an abundant number, since it is smaller than the sum of its proper divisors (1015432).

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

615680 is a wasteful number, since it uses less digits than its factorization.

615680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 615680 is about 784.6527894553. The cubic root of 615680 is about 85.0716811715.

The spelling of 615680 in words is "six hundred fifteen thousand, six hundred eighty".