6997428 has 72 divisors (see below), whose sum is σ = 19201728. Its totient is φ = 2223936.

The previous prime is 6997411. The next prime is 6997457. The reversal of 6997428 is 8247996.

It is a happy number.

It is an Ulam number.

It is a zygodrome in base 7.

It is a congruent number.

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, 22200 + ... + 22512.

Almost surely, 2^6997428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6997428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9600864).

6997428 is an abundant number, since it is smaller than the sum of its proper divisors (12204300).

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

6997428 is a wasteful number, since it uses less digits than its factorization.

6997428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 341 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 6997428 is about 2645.2652040958. The cubic root of 6997428 is about 191.2696865548.

The spelling of 6997428 in words is "six million, nine hundred ninety-seven thousand, four hundred twenty-eight".