215317630 has 64 divisors (see below), whose sum is σ = 439934976. Its totient is φ = 75168000.

The previous prime is 215317603. The next prime is 215317639. The reversal of 215317630 is 36713512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215317639) 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, 794395 + ... + 794665.

It is an arithmetic number, because the mean of its divisors is an integer number (6873984).

Almost surely, 2^215317630 is an apocalyptic number.

215317630 is an abundant number, since it is smaller than the sum of its proper divisors (224617346).

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

215317630 is a wasteful number, since it uses less digits than its factorization.

215317630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 215317630 is about 14673.7053943440. The cubic root of 215317630 is about 599.3675094197.

It can be divided in two parts, 21531 and 7630, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 215317630 in words is "two hundred fifteen million, three hundred seventeen thousand, six hundred thirty".