28941220 has 48 divisors (see below), whose sum is σ = 75777408. Its totient is φ = 9020160.

The previous prime is 28941181. The next prime is 28941229. The reversal of 28941220 is 2214982.

28941220 = T₃₃₀ + T₃₃₁ + ... + T₅₉₃.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (28941229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7857 + ... + 10936.

It is an arithmetic number, because the mean of its divisors is an integer number (1578696).

Almost surely, 2^28941220 is an apocalyptic number.

28941220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28941220 is an abundant number, since it is smaller than the sum of its proper divisors (46836188).

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

28941220 is a wasteful number, since it uses less digits than its factorization.

28941220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18820 (or 18818 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28941220 is about 5379.7044528487. The cubic root of 28941220 is about 307.0239665530.

It can be divided in two parts, 28941 and 220, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 28941220 in words is "twenty-eight million, nine hundred forty-one thousand, two hundred twenty".