321978150 has 144 divisors (see below), whose sum is σ = 972500256. Its totient is φ = 75778560.

The previous prime is 321978101. The next prime is 321978157. The reversal of 321978150 is 51879123.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321978157) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 133354 + ... + 135746.

It is an arithmetic number, because the mean of its divisors is an integer number (6753474).

Almost surely, 2^321978150 is an apocalyptic number.

321978150 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 321978150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486250128).

321978150 is an abundant number, since it is smaller than the sum of its proper divisors (650522106).

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

321978150 is a wasteful number, since it uses less digits than its factorization.

321978150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2447 (or 2439 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 321978150 is about 17943.7496081505. The cubic root of 321978150 is about 685.3968964569.

The spelling of 321978150 in words is "three hundred twenty-one million, nine hundred seventy-eight thousand, one hundred fifty".