9215378172 has 288 divisors, whose sum is σ = 31947761664. Its totient is φ = 2162073600.

The previous prime is 9215378171. The next prime is 9215378201. The reversal of 9215378172 is 2718735129.

It is a super-3 number, since 3×9215378172³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9215378171) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1690972 + ... + 1696412.

It is an arithmetic number, because the mean of its divisors is an integer number (110929728).

Almost surely, 2^9215378172 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 9215378172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15973880832).

9215378172 is an abundant number, since it is smaller than the sum of its proper divisors (22732383492).

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

9215378172 is a wasteful number, since it uses less digits than its factorization.

9215378172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5529 (or 5524 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 9215378172 is about 95996.7612578674. The cubic root of 9215378172 is about 2096.5459600710.

The spelling of 9215378172 in words is "nine billion, two hundred fifteen million, three hundred seventy-eight thousand, one hundred seventy-two".