80781428 has 48 divisors (see below), whose sum is σ = 181574400. Its totient is φ = 30564864.

The previous prime is 80781409. The next prime is 80781511. The reversal of 80781428 is 82418708.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 80781391 and 80781400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3548 + ... + 13196.

It is an arithmetic number, because the mean of its divisors is an integer number (3782800).

Almost surely, 2^80781428 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 80781428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90787200).

80781428 is an abundant number, since it is smaller than the sum of its proper divisors (100792972).

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

80781428 is a wasteful number, since it uses less digits than its factorization.

80781428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9696 (or 9694 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 80781428 is about 8987.8489083874. The cubic root of 80781428 is about 432.2853410370.

The spelling of 80781428 in words is "eighty million, seven hundred eighty-one thousand, four hundred twenty-eight".