690720 has 48 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 184064.

The previous prime is 690719. The next prime is 690721. The reversal of 690720 is 27096.

It is an interprime number because it is at equal distance from previous prime (690719) and next prime (690721).

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (690721) 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, 240 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁶⁹⁰⁷²⁰ is an apocalyptic number.

690720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640).

690720 is an abundant number, since it is smaller than the sum of its proper divisors (1486560).

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

690720 is a wasteful number, since it uses less digits than its factorization.

690720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457 (or 1449 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 690720 is about 831.0956623638. The cubic root of 690720 is about 88.3962843862.

The spelling of 690720 in words is "six hundred ninety thousand, seven hundred twenty".