78219732 has 48 divisors (see below), whose sum is σ = 195773760. Its totient is φ = 24231168.

The previous prime is 78219721. The next prime is 78219761. The reversal of 78219732 is 23791287.

It is a super-2 number, since 2×78219732² = 12236652948303648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8848 + ... + 15320.

It is an arithmetic number, because the mean of its divisors is an integer number (4078620).

Almost surely, 2^78219732 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 78219732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97886880).

78219732 is an abundant number, since it is smaller than the sum of its proper divisors (117554028).

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

78219732 is a wasteful number, since it uses less digits than its factorization.

78219732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6552 (or 6550 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 78219732 is about 8844.1919924886. The cubic root of 78219732 is about 427.6667056142. Note that the first 3 decimals are identical.

The spelling of 78219732 in words is "seventy-eight million, two hundred nineteen thousand, seven hundred thirty-two".