635970 has 64 divisors (see below), whose sum is σ = 1710720. Its totient is φ = 150528.

The previous prime is 635969. The next prime is 635977. The reversal of 635970 is 79536.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14769 + ... + 14811.

It is an arithmetic number, because the mean of its divisors is an integer number (26730).

2⁶³⁵⁹⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 635970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (855360).

635970 is an abundant number, since it is smaller than the sum of its proper divisors (1074750).

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

635970 is a wasteful number, since it uses less digits than its factorization.

635970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 635970 is about 797.4772724034. The cubic root of 635970 is about 85.9961238563.

The spelling of 635970 in words is "six hundred thirty-five thousand, nine hundred seventy".