78140025 has 24 divisors (see below), whose sum is σ = 143547360. Its totient is φ = 41674320.

The previous prime is 78140009. The next prime is 78140071. The reversal of 78140025 is 52004187.

It is not a de Polignac number, because 78140025 - 2⁴ = 78140009 is a prime.

It is a super-2 number, since 2×78140025² = 12211727014001250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

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, 57207 + ... + 58556.

It is an arithmetic number, because the mean of its divisors is an integer number (5981140).

Almost surely, 2^78140025 is an apocalyptic number.

78140025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78140025 is a deficient number, since it is larger than the sum of its proper divisors (65407335).

78140025 is a wasteful number, since it uses less digits than its factorization.

78140025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115782 (or 115771 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 78140025 is about 8839.6846663215. The cubic root of 78140025 is about 427.5213901270.

The spelling of 78140025 in words is "seventy-eight million, one hundred forty thousand, twenty-five".