78842425 has 12 divisors (see below), whose sum is σ = 98664940. Its totient is φ = 62493120.

The previous prime is 78842389. The next prime is 78842431. The reversal of 78842425 is 52424887.

It can be written as a sum of positive squares in 6 ways, for example, as 59049 + 78783376 = 243^2 + 8876^2 .

It is not a de Polignac number, because 78842425 - 2⁷ = 78842297 is a prime.

It is a super-2 number, since 2×78842425² = 12432255959761250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11742 + ... + 17191.

Almost surely, 2^78842425 is an apocalyptic number.

It is an amenable number.

78842425 is a deficient number, since it is larger than the sum of its proper divisors (19822515).

78842425 is a wasteful number, since it uses less digits than its factorization.

78842425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29052 (or 29047 counting only the distinct ones).

The product of its digits is 143360, while the sum is 40.

The square root of 78842425 is about 8879.3257063811. The cubic root of 78842425 is about 428.7985662387.

The spelling of 78842425 in words is "seventy-eight million, eight hundred forty-two thousand, four hundred twenty-five".