694225728 has 252 divisors, whose sum is σ = 2403116352. Its totient is φ = 198132480.

The previous prime is 694225661. The next prime is 694225759. The reversal of 694225728 is 827522496.

It is a tau number, because it is divible by the number of its divisors (252).

It is a super-2 number, since 2×694225728² = 963898722834259968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 761593 + ... + 762503.

It is an arithmetic number, because the mean of its divisors is an integer number (9536176).

Almost surely, 2^694225728 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 694225728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1201558176).

694225728 is an abundant number, since it is smaller than the sum of its proper divisors (1708890624).

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

694225728 is an equidigital number, since it uses as much as digits as its factorization.

694225728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 923 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 694225728 is about 26348.1636551772. The cubic root of 694225728 is about 885.4558295287.

The spelling of 694225728 in words is "six hundred ninety-four million, two hundred twenty-five thousand, seven hundred twenty-eight".