428009823 has 6 divisors (see below), whose sum is σ = 618236424. Its totient is φ = 285339876.

The previous prime is 428009819. The next prime is 428009837. The reversal of 428009823 is 328900824.

It is not a de Polignac number, because 428009823 - 2² = 428009819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428009863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23778315 + ... + 23778332.

It is an arithmetic number, because the mean of its divisors is an integer number (103039404).

Almost surely, 2^428009823 is an apocalyptic number.

428009823 is a deficient number, since it is larger than the sum of its proper divisors (190226601).

428009823 is a wasteful number, since it uses less digits than its factorization.

428009823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47556653 (or 47556650 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 428009823 is about 20688.3982705283. The cubic root of 428009823 is about 753.6179696633.

The spelling of 428009823 in words is "four hundred twenty-eight million, nine thousand, eight hundred twenty-three".