28771420 has 24 divisors (see below), whose sum is σ = 60732000. Its totient is φ = 11449152.

The previous prime is 28771373. The next prime is 28771439. The reversal of 28771420 is 2417782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366 + ... + 7594.

It is an arithmetic number, because the mean of its divisors is an integer number (2530500).

Almost surely, 2^28771420 is an apocalyptic number.

28771420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28771420 is an abundant number, since it is smaller than the sum of its proper divisors (31960580).

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

28771420 is a wasteful number, since it uses less digits than its factorization.

28771420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7437 (or 7435 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 28771420 is about 5363.8997007774. The cubic root of 28771420 is about 306.4223453084.

The spelling of 28771420 in words is "twenty-eight million, seven hundred seventy-one thousand, four hundred twenty".