428600642 has 6 divisors (see below), whose sum is σ = 642944883. Its totient is φ = 214285682.

The previous prime is 428600639. The next prime is 428600647. The reversal of 428600642 is 246006824.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 214300321 + 214300321 = 14639^2 + 14639^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=14639.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428600599 and 428600608.

It is not an unprimeable number, because it can be changed into a prime (428600647) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 21959 + ... + 36597.

Almost surely, 2^428600642 is an apocalyptic number.

428600642 is a deficient number, since it is larger than the sum of its proper divisors (214344241).

428600642 is an frugal number, since it uses more digits than its factorization.

428600642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29280 (or 14641 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 428600642 is about 20702.6723395797. The cubic root of 428600642 is about 753.9645715986.

Multiplying 428600642 by its sum of digits (32), we get a square (13715220544 = 117112²).

Multiplying 428600642 by its product of nonzero digits (18432), we get a square (7899967033344 = 2810688²).

The spelling of 428600642 in words is "four hundred twenty-eight million, six hundred thousand, six hundred forty-two".