78047425 has 24 divisors (see below), whose sum is σ = 102951000. Its totient is φ = 58490880.

The previous prime is 78047419. The next prime is 78047443. The reversal of 78047425 is 52474087.

It can be written as a sum of positive squares in 12 ways, for example, as 589824 + 77457601 = 768^2 + 8801^2 .

It is not a de Polignac number, because 78047425 - 2¹⁹ = 77523137 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 173601 + ... + 174049.

It is an arithmetic number, because the mean of its divisors is an integer number (4289625).

Almost surely, 2^78047425 is an apocalyptic number.

It is an amenable number.

78047425 is a deficient number, since it is larger than the sum of its proper divisors (24903575).

78047425 is a wasteful number, since it uses less digits than its factorization.

78047425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 78047425 is about 8834.4453702539. The cubic root of 78047425 is about 427.3524450008.

It can be divided in two parts, 780 and 47425, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 78047425 in words is "seventy-eight million, forty-seven thousand, four hundred twenty-five".