78039040 has 48 divisors (see below), whose sum is σ = 187272540. Its totient is φ = 31211520.

The previous prime is 78039037. The next prime is 78039041. The reversal of 78039040 is 4093087.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76317696 + 1721344 = 8736^2 + 1312^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78038993 and 78039011.

It is not an unprimeable number, because it can be changed into a prime (78039041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6430 + ... + 14050.

Almost surely, 2^78039040 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 78039040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93636270).

78039040 is an abundant number, since it is smaller than the sum of its proper divisors (109233500).

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

78039040 is an equidigital number, since it uses as much as digits as its factorization.

78039040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7648 (or 7628 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 78039040 is about 8833.9707946087. The cubic root of 78039040 is about 427.3371402952.

The spelling of 78039040 in words is "seventy-eight million, thirty-nine thousand, forty".