8021393280 has 128 divisors (see below), whose sum is σ = 28409162400. Its totient is φ = 2139033600.

The previous prime is 8021393273. The next prime is 8021393293. The reversal of 8021393280 is 823931208.

It is a happy number.

8021393280 is a `hidden beast` number, since 80 + 213 + 93 + 280 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 214821 + ... + 249380.

Almost surely, 2^8021393280 is an apocalyptic number.

8021393280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8021393280 is an abundant number, since it is smaller than the sum of its proper divisors (20387769120).

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

8021393280 is a wasteful number, since it uses less digits than its factorization.

8021393280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464229 (or 464211 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 8021393280 is about 89562.2313254867. The cubic root of 8021393280 is about 2001.7811865497.

The spelling of 8021393280 in words is "eight billion, twenty-one million, three hundred ninety-three thousand, two hundred eighty".