78030025 has 6 divisors (see below), whose sum is σ = 96757262. Its totient is φ = 62424000.

The previous prime is 78030023. The next prime is 78030061. The reversal of 78030025 is 52003087.

It can be written as a sum of positive squares in 3 ways, for example, as 17065161 + 60964864 = 4131^2 + 7808^2 .

It is not a de Polignac number, because 78030025 - 2¹ = 78030023 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 3121201 = 78030025 / (7 + 8 + 0 + 3 + 0 + 0 + 2 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78030023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1560576 + ... + 1560625.

Almost surely, 2^78030025 is an apocalyptic number.

It is an amenable number.

78030025 is a deficient number, since it is larger than the sum of its proper divisors (18727237).

78030025 is a wasteful number, since it uses less digits than its factorization.

78030025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3121211 (or 3121206 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 78030025 is about 8833.4605336754. The cubic root of 78030025 is about 427.3206844603.

The spelling of 78030025 in words is "seventy-eight million, thirty thousand, twenty-five".