56728216 has 8 divisors (see below), whose sum is σ = 106365420. Its totient is φ = 28364104.

The previous prime is 56728213. The next prime is 56728229. The reversal of 56728216 is 61282765.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56728211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3545506 + ... + 3545521.

Almost surely, 2^56728216 is an apocalyptic number.

It is an amenable number.

56728216 is a deficient number, since it is larger than the sum of its proper divisors (49637204).

56728216 is a wasteful number, since it uses less digits than its factorization.

56728216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7091033 (or 7091029 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 56728216 is about 7531.8135930199. The cubic root of 56728216 is about 384.2374652453.

The spelling of 56728216 in words is "fifty-six million, seven hundred twenty-eight thousand, two hundred sixteen".