698624 has 18 divisors (see below), whose sum is σ = 1395030. Its totient is φ = 349184.

The previous prime is 698591. The next prime is 698641. The reversal of 698624 is 426896.

It can be written as a sum of positive squares in only one way, i.e., 692224 + 6400 = 832^2 + 80^2 .

It is a nialpdrome in base 4 and base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 698624.

It is an unprimeable number.

698624 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109 + ... + 1620.

2⁶⁹⁸⁶²⁴ is an apocalyptic number.

698624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

698624 is a deficient number, since it is larger than the sum of its proper divisors (696406).

698624 is an equidigital number, since it uses as much as digits as its factorization.

698624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745 (or 2731 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 698624 is about 835.8373047430. The cubic root of 698624 is about 88.7321831589.

The spelling of 698624 in words is "six hundred ninety-eight thousand, six hundred twenty-four".