78681497 has 4 divisors (see below), whose sum is σ = 78896256. Its totient is φ = 78466740.

The previous prime is 78681479. The next prime is 78681509. The reversal of 78681497 is 79418687.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78681497 - 2⁶ = 78681433 is a prime.

It is a super-2 number, since 2×78681497² = 12381555940322018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78681467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106829 + ... + 107562.

It is an arithmetic number, because the mean of its divisors is an integer number (19724064).

Almost surely, 2^78681497 is an apocalyptic number.

It is an amenable number.

78681497 is a deficient number, since it is larger than the sum of its proper divisors (214759).

78681497 is a wasteful number, since it uses less digits than its factorization.

78681497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214758.

The product of its digits is 677376, while the sum is 50.

The square root of 78681497 is about 8870.2591281202. The cubic root of 78681497 is about 428.5066223225.

The spelling of 78681497 in words is "seventy-eight million, six hundred eighty-one thousand, four hundred ninety-seven".