72223788 has 144 divisors (see below), whose sum is σ = 222091520. Its totient is φ = 17739648.

The previous prime is 72223783. The next prime is 72223799. The reversal of 72223788 is 88732227.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (72223783) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1224103 + ... + 1224161.

Almost surely, 2^72223788 is an apocalyptic number.

72223788 is a gapful number since it is divisible by the number (78) 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 72223788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111045760).

72223788 is an abundant number, since it is smaller than the sum of its proper divisors (149867732).

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

72223788 is a wasteful number, since it uses less digits than its factorization.

72223788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 103 counting only the distinct ones).

The product of its digits is 75264, while the sum is 39.

The square root of 72223788 is about 8498.4579777746. The cubic root of 72223788 is about 416.4473353030.

The spelling of 72223788 in words is "seventy-two million, two hundred twenty-three thousand, seven hundred eighty-eight".