1690728 has 32 divisors (see below), whose sum is σ = 4552800. Its totient is φ = 520128.

The previous prime is 1690727. The next prime is 1690739. The reversal of 1690728 is 8270961.

It is a super-2 number, since 2×1690728² = 5717122339968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1690727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2398 + ... + 3021.

It is an arithmetic number, because the mean of its divisors is an integer number (142275).

2^1690728 is an apocalyptic number.

It is an amenable number.

1690728 is an abundant number, since it is smaller than the sum of its proper divisors (2862072).

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

1690728 is a wasteful number, since it uses less digits than its factorization.

1690728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441 (or 5437 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1690728 is about 1300.2799698526. The cubic root of 1690728 is about 119.1309435904.

The spelling of 1690728 in words is "one million, six hundred ninety thousand, seven hundred twenty-eight".