428610221522 has 54 divisors (see below), whose sum is σ = 767042543439. Its totient is φ = 179098745280.

The previous prime is 428610221491. The next prime is 428610221551. The reversal of 428610221522 is 225122016824.

It can be written as a sum of positive squares in 5 ways, for example, as 49697339041 + 378912882481 = 222929^2 + 615559^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=462931.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 265721588 + ... + 265723200.

Almost surely, 2^428610221522 is an apocalyptic number.

428610221522 is a deficient number, since it is larger than the sum of its proper divisors (338432321917).

428610221522 is an frugal number, since it uses more digits than its factorization.

428610221522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324 (or 1663 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The spelling of 428610221522 in words is "four hundred twenty-eight billion, six hundred ten million, two hundred twenty-one thousand, five hundred twenty-two".