78438250 has 48 divisors (see below), whose sum is σ = 161460936. Its totient is φ = 28512000.

The previous prime is 78438233. The next prime is 78438259. The reversal of 78438250 is 5283487.

It can be written as a sum of positive squares in 4 ways, for example, as 26842761 + 51595489 = 5181^2 + 7183^2 .

It is not an unprimeable number, because it can be changed into a prime (78438259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28954 + ... + 31546.

Almost surely, 2^78438250 is an apocalyptic number.

78438250 is an abundant number, since it is smaller than the sum of its proper divisors (83022686).

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

78438250 is a wasteful number, since it uses less digits than its factorization.

78438250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632 (or 2611 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 78438250 is about 8856.5371336657. The cubic root of 78438250 is about 428.0645846870.

The spelling of 78438250 in words is "seventy-eight million, four hundred thirty-eight thousand, two hundred fifty".