78222732 has 48 divisors (see below), whose sum is σ = 210642432. Its totient is φ = 22129920.

The previous prime is 78222689. The next prime is 78222733. The reversal of 78222732 is 23722287.

It is a super-2 number, since 2×78222732² = 12237591603087648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78222693 and 78222702.

It is not an unprimeable number, because it can be changed into a prime (78222733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4132 + ... + 13172.

It is an arithmetic number, because the mean of its divisors is an integer number (4388384).

Almost surely, 2^78222732 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 78222732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105321216).

78222732 is an abundant number, since it is smaller than the sum of its proper divisors (132419700).

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

78222732 is a wasteful number, since it uses less digits than its factorization.

78222732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9158 (or 9156 counting only the distinct ones).

The product of its digits is 18816, while the sum is 33.

The square root of 78222732 is about 8844.3615936935. The cubic root of 78222732 is about 427.6721730484.

The spelling of 78222732 in words is "seventy-eight million, two hundred twenty-two thousand, seven hundred thirty-two".