78253230615 has 32 divisors (see below), whose sum is σ = 150622763520. Its totient is φ = 33890120064.

The previous prime is 78253230611. The next prime is 78253230631. The reversal of 78253230615 is 51603235287.

It is a happy number.

It is not a de Polignac number, because 78253230615 - 2² = 78253230611 is a prime.

It is a super-2 number, since 2×78253230615² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78253230611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19610344 + ... + 19614333.

It is an arithmetic number, because the mean of its divisors is an integer number (4706961360).

Almost surely, 2^78253230615 is an apocalyptic number.

78253230615 is a deficient number, since it is larger than the sum of its proper divisors (72369532905).

78253230615 is a wasteful number, since it uses less digits than its factorization.

78253230615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39224711.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 78253230615 in words is "seventy-eight billion, two hundred fifty-three million, two hundred thirty thousand, six hundred fifteen".