80400728 has 16 divisors (see below), whose sum is σ = 151678680. Its totient is φ = 39953088.

The previous prime is 80400721. The next prime is 80400751. The reversal of 80400728 is 82700408.

It is a self number, because there is not a number n which added to its sum of digits gives 80400728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80400721) 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, 29525 + ... + 32132.

Almost surely, 2^80400728 is an apocalyptic number.

It is an amenable number.

80400728 is a deficient number, since it is larger than the sum of its proper divisors (71277952).

80400728 is a wasteful number, since it uses less digits than its factorization.

80400728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61826 (or 61822 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 80400728 is about 8966.6453035681. The cubic root of 80400728 is about 431.6051919897.

The spelling of 80400728 in words is "eighty million, four hundred thousand, seven hundred twenty-eight".