78243025 has 24 divisors (see below), whose sum is σ = 111760704. Its totient is φ = 53227200.

The previous prime is 78243017. The next prime is 78243037. The reversal of 78243025 is 52034287.

78243025 = T₂₆₂ + T₂₆₃ + ... + T₇₈₆.

It is not a de Polignac number, because 78243025 - 2³ = 78243017 is a prime.

It is a super-2 number, since 2×78243025² = 12243941922301250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21219 + ... + 24631.

It is an arithmetic number, because the mean of its divisors is an integer number (4656696).

Almost surely, 2^78243025 is an apocalyptic number.

It is an amenable number.

78243025 is a deficient number, since it is larger than the sum of its proper divisors (33517679).

78243025 is a wasteful number, since it uses less digits than its factorization.

78243025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561 (or 3556 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 78243025 is about 8845.5087473814. The cubic root of 78243025 is about 427.7091529254.

The spelling of 78243025 in words is "seventy-eight million, two hundred forty-three thousand, twenty-five".