72397451280 has 320 divisors, whose sum is σ = 280841453568. Its totient is φ = 14988257280.

The previous prime is 72397451263. The next prime is 72397451299. The reversal of 72397451280 is 8215479327.

It is a happy number.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 5111889 + ... + 5126031.

Almost surely, 2^72397451280 is an apocalyptic number.

72397451280 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 72397451280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140420726784).

72397451280 is an abundant number, since it is smaller than the sum of its proper divisors (208444002288).

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

72397451280 is a wasteful number, since it uses less digits than its factorization.

72397451280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14454 (or 14448 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 72397451280 in words is "seventy-two billion, three hundred ninety-seven million, four hundred fifty-one thousand, two hundred eighty".