72123380 has 96 divisors (see below), whose sum is σ = 180182016. Its totient is φ = 23740416.

The previous prime is 72123379. The next prime is 72123383. The reversal of 72123380 is 8332127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72123383) 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, 638204 + ... + 638316.

It is an arithmetic number, because the mean of its divisors is an integer number (1876896).

Almost surely, 2^72123380 is an apocalyptic number.

72123380 is a gapful number since it is divisible by the number (70) 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 72123380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90091008).

72123380 is an abundant number, since it is smaller than the sum of its proper divisors (108058636).

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

72123380 is a wasteful number, since it uses less digits than its factorization.

72123380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 72123380 is about 8492.5484985368. The cubic root of 72123380 is about 416.2542593209.

The spelling of 72123380 in words is "seventy-two million, one hundred twenty-three thousand, three hundred eighty".