215398738680 has 256 divisors, whose sum is σ = 724221388800. Its totient is φ = 50930933760.

The previous prime is 215398738657. The next prime is 215398738703. The reversal of 215398738680 is 86837893512.

It is an interprime number because it is at equal distance from previous prime (215398738657) and next prime (215398738703).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7000209 + ... + 7030911.

It is an arithmetic number, because the mean of its divisors is an integer number (2828989800).

Almost surely, 2^215398738680 is an apocalyptic number.

215398738680 is a gapful number since it is divisible by the number (20) 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 215398738680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362110694400).

215398738680 is an abundant number, since it is smaller than the sum of its proper divisors (508822650120).

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

215398738680 is a wasteful number, since it uses less digits than its factorization.

215398738680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30934 (or 30930 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 60.

The spelling of 215398738680 in words is "two hundred fifteen billion, three hundred ninety-eight million, seven hundred thirty-eight thousand, six hundred eighty".