78159497 has 16 divisors (see below), whose sum is σ = 88397568. Its totient is φ = 68566080.

The previous prime is 78159479. The next prime is 78159511. The reversal of 78159497 is 79495187.

It is a cyclic number.

It is not a de Polignac number, because 78159497 - 2⁸ = 78159241 is a prime.

It is a super-2 number, since 2×78159497² = 12217813942586018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78159457) 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, 50972 + ... + 52482.

It is an arithmetic number, because the mean of its divisors is an integer number (5524848).

Almost surely, 2^78159497 is an apocalyptic number.

It is an amenable number.

78159497 is a deficient number, since it is larger than the sum of its proper divisors (10238071).

78159497 is a wasteful number, since it uses less digits than its factorization.

78159497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720.

The product of its digits is 635040, while the sum is 50.

The square root of 78159497 is about 8840.7859944690. The cubic root of 78159497 is about 427.5568990531.

The spelling of 78159497 in words is "seventy-eight million, one hundred fifty-nine thousand, four hundred ninety-seven".