690428 has 6 divisors (see below), whose sum is σ = 1208256. Its totient is φ = 345212.

The previous prime is 690427. The next prime is 690433. The reversal of 690428 is 824096.

690428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 690428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86300 + ... + 86307.

It is an arithmetic number, because the mean of its divisors is an integer number (201376).

2⁶⁹⁰⁴²⁸ is an apocalyptic number.

It is an amenable number.

690428 is a deficient number, since it is larger than the sum of its proper divisors (517828).

690428 is a wasteful number, since it uses less digits than its factorization.

690428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172611 (or 172609 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 690428 is about 830.9199720791. The cubic root of 690428 is about 88.3838262009.

The spelling of 690428 in words is "six hundred ninety thousand, four hundred twenty-eight".