61040728 has 16 divisors (see below), whose sum is σ = 130801680. Its totient is φ = 26160288.

The previous prime is 61040723. The next prime is 61040753. The reversal of 61040728 is 82704016.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 61040696 and 61040705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61040723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544951 + ... + 545062.

It is an arithmetic number, because the mean of its divisors is an integer number (8175105).

Almost surely, 2^61040728 is an apocalyptic number.

It is an amenable number.

61040728 is an abundant number, since it is smaller than the sum of its proper divisors (69760952).

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

61040728 is a wasteful number, since it uses less digits than its factorization.

61040728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090026 (or 1090022 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 61040728 is about 7812.8565838623. The cubic root of 61040728 is about 393.7373084681.

The spelling of 61040728 in words is "sixty-one million, forty thousand, seven hundred twenty-eight".