78159625 has 16 divisors (see below), whose sum is σ = 103283856. Its totient is φ = 58848000.

The previous prime is 78159619. The next prime is 78159629. The reversal of 78159625 is 52695187.

It can be written as a sum of positive squares in 8 ways, for example, as 40998409 + 37161216 = 6403^2 + 6096^2 .

It is not a de Polignac number, because 78159625 - 2¹⁵ = 78126857 is a prime.

It is a super-2 number, since 2×78159625² = 12217853960281250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78159629) 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, 16266 + ... + 20515.

It is an arithmetic number, because the mean of its divisors is an integer number (6455241).

Almost surely, 2^78159625 is an apocalyptic number.

It is an amenable number.

78159625 is a deficient number, since it is larger than the sum of its proper divisors (25124231).

78159625 is a wasteful number, since it uses less digits than its factorization.

78159625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36813 (or 36803 counting only the distinct ones).

The product of its digits is 151200, while the sum is 43.

The square root of 78159625 is about 8840.7932336414. The cubic root of 78159625 is about 427.5571324530.

It can be divided in two parts, 781 and 59625, that added together give a palindrome (60406).

The spelling of 78159625 in words is "seventy-eight million, one hundred fifty-nine thousand, six hundred twenty-five".