78263240 has 64 divisors (see below), whose sum is σ = 203420160. Its totient is φ = 26782720.

The previous prime is 78263221. The next prime is 78263243. The reversal of 78263240 is 4236287.

It is a super-2 number, since 2×78263240² = 12250269470595200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78263197 and 78263206.

It is not an unprimeable number, because it can be changed into a prime (78263243) 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, 2249 + ... + 12711.

It is an arithmetic number, because the mean of its divisors is an integer number (3178440).

Almost surely, 2^78263240 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 78263240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101710080).

78263240 is an abundant number, since it is smaller than the sum of its proper divisors (125156920).

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

78263240 is a wasteful number, since it uses less digits than its factorization.

78263240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10502 (or 10498 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 78263240 is about 8846.6513438702. The cubic root of 78263240 is about 427.7459843065.

The spelling of 78263240 in words is "seventy-eight million, two hundred sixty-three thousand, two hundred forty".