28572420 has 48 divisors (see below), whose sum is σ = 80438400. Its totient is φ = 7577856.

The previous prime is 28572413. The next prime is 28572437. The reversal of 28572420 is 2427582.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 10744 + ... + 13136.

It is an arithmetic number, because the mean of its divisors is an integer number (1675800).

Almost surely, 2^28572420 is an apocalyptic number.

28572420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28572420 is an abundant number, since it is smaller than the sum of its proper divisors (51865980).

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

28572420 is a wasteful number, since it uses less digits than its factorization.

28572420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604 (or 2602 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28572420 is about 5345.3175770949. The cubic root of 28572420 is about 305.7142447458.

The spelling of 28572420 in words is "twenty-eight million, five hundred seventy-two thousand, four hundred twenty".