420728000690 has 48 divisors (see below), whose sum is σ = 782764733016. Its totient is φ = 162813150720.

The previous prime is 420728000689. The next prime is 420728000701. The reversal of 420728000690 is 96000827024.

It can be written as a sum of positive squares in 4 ways, for example, as 401774696449 + 18953304241 = 633857^2 + 137671^2 .

It is a super-2 number, since 2×420728000690² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60126272 + ... + 60133268.

Almost surely, 2^420728000690 is an apocalyptic number.

420728000690 is a deficient number, since it is larger than the sum of its proper divisors (362036732326).

420728000690 is a wasteful number, since it uses less digits than its factorization.

420728000690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13323 (or 13292 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 420728000690 in words is "four hundred twenty billion, seven hundred twenty-eight million, six hundred ninety", and thus it is an aban number.