163997428 has 24 divisors (see below), whose sum is σ = 328361600. Its totient is φ = 70206048.

The previous prime is 163997401. The next prime is 163997461. The reversal of 163997428 is 824799361.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27193 + ... + 32671.

Almost surely, 2^163997428 is an apocalyptic number.

It is an amenable number.

163997428 is an abundant number, since it is smaller than the sum of its proper divisors (164364172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163997428 is a wasteful number, since it uses less digits than its factorization.

163997428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6559 (or 6557 counting only the distinct ones).

The product of its digits is 653184, while the sum is 49.

The square root of 163997428 is about 12806.1480547431. The cubic root of 163997428 is about 547.3675060084.

The spelling of 163997428 in words is "one hundred sixty-three million, nine hundred ninety-seven thousand, four hundred twenty-eight".