78257625 has 16 divisors (see below), whose sum is σ = 130221312. Its totient is φ = 41737200.

The previous prime is 78257623. The next prime is 78257687. The reversal of 78257625 is 52675287.

It is not a de Polignac number, because 78257625 - 2¹ = 78257623 is a prime.

It is a super-2 number, since 2×78257625² = 12248511741281250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78257623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103969 + ... + 104718.

It is an arithmetic number, because the mean of its divisors is an integer number (8138832).

Almost surely, 2^78257625 is an apocalyptic number.

78257625 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78257625 is a deficient number, since it is larger than the sum of its proper divisors (51963687).

78257625 is a wasteful number, since it uses less digits than its factorization.

78257625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208705 (or 208695 counting only the distinct ones).

The product of its digits is 235200, while the sum is 42.

The square root of 78257625 is about 8846.3339864602. Note that the first 3 decimals coincide. The cubic root of 78257625 is about 427.7357545096.

The spelling of 78257625 in words is "seventy-eight million, two hundred fifty-seven thousand, six hundred twenty-five".