28611420 has 48 divisors (see below), whose sum is σ = 80444448. Its totient is φ = 7598080.

The previous prime is 28611409. The next prime is 28611421. The reversal of 28611420 is 2411682.

It is a super-2 number, since 2×28611420² = 1637226708832800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28611421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16012 + ... + 17708.

It is an arithmetic number, because the mean of its divisors is an integer number (1675926).

Almost surely, 2^28611420 is an apocalyptic number.

28611420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28611420 is an abundant number, since it is smaller than the sum of its proper divisors (51833028).

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

28611420 is a wasteful number, since it uses less digits than its factorization.

28611420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 28611420 is about 5348.9643857480. The cubic root of 28611420 is about 305.8532766624.

The spelling of 28611420 in words is "twenty-eight million, six hundred eleven thousand, four hundred twenty".