4028720 has 20 divisors (see below), whose sum is σ = 9366960. Its totient is φ = 1611456.

The previous prime is 4028707. The next prime is 4028723. The reversal of 4028720 is 278204.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (4028723) 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, 25100 + ... + 25259.

It is an arithmetic number, because the mean of its divisors is an integer number (468348).

Almost surely, 2^4028720 is an apocalyptic number.

4028720 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4028720 is an abundant number, since it is smaller than the sum of its proper divisors (5338240).

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

4028720 is a wasteful number, since it uses less digits than its factorization.

4028720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50372 (or 50366 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 4028720 is about 2007.1671579617. The cubic root of 4028720 is about 159.1191175213.

The spelling of 4028720 in words is "four million, twenty-eight thousand, seven hundred twenty".