78372280 has 64 divisors (see below), whose sum is σ = 203394240. Its totient is φ = 26621952.

The previous prime is 78372277. The next prime is 78372331. The reversal of 78372280 is 8227387.

It is a super-2 number, since 2×78372280² = 12284428544796800, 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, 30402 + ... + 32878.

It is an arithmetic number, because the mean of its divisors is an integer number (3178035).

Almost surely, 2^78372280 is an apocalyptic number.

78372280 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 78372280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101697120).

78372280 is an abundant number, since it is smaller than the sum of its proper divisors (125021960).

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

78372280 is a wasteful number, since it uses less digits than its factorization.

78372280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608 (or 2604 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 78372280 is about 8852.8119826414. The cubic root of 78372280 is about 427.9445440129.

The spelling of 78372280 in words is "seventy-eight million, three hundred seventy-two thousand, two hundred eighty".