1428571220 has 48 divisors (see below), whose sum is σ = 3045181440. Its totient is φ = 562857984.

The previous prime is 1428571219. The next prime is 1428571223. The reversal of 1428571220 is 221758241.

It is a super-2 number, since 2×1428571220² = 4081631461224576800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428571223) 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, 910877 + ... + 912443.

It is an arithmetic number, because the mean of its divisors is an integer number (63441280).

Almost surely, 2^1428571220 is an apocalyptic number.

1428571220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1428571220 is an abundant number, since it is smaller than the sum of its proper divisors (1616610220).

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

1428571220 is a wasteful number, since it uses less digits than its factorization.

1428571220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232 (or 2230 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 1428571220 is about 37796.4445417820. Note that the first 3 decimals coincide. The cubic root of 1428571220 is about 1126.2478256329.

The spelling of 1428571220 in words is "one billion, four hundred twenty-eight million, five hundred seventy-one thousand, two hundred twenty".