428561693 has 24 divisors (see below), whose sum is σ = 512474688. Its totient is φ = 358190784.

The previous prime is 428561671. The next prime is 428561717. The reversal of 428561693 is 396165824.

It is not a de Polignac number, because 428561693 - 2⁶ = 428561629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428561633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 722405 + ... + 722997.

It is an arithmetic number, because the mean of its divisors is an integer number (21353112).

Almost surely, 2^428561693 is an apocalyptic number.

428561693 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

It is an amenable number.

428561693 is a deficient number, since it is larger than the sum of its proper divisors (83912995).

428561693 is an frugal number, since it uses more digits than its factorization.

428561693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 643 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 428561693 is about 20701.7316425462. The cubic root of 428561693 is about 753.9417321121.

The spelling of 428561693 in words is "four hundred twenty-eight million, five hundred sixty-one thousand, six hundred ninety-three".