78158801 has 4 divisors (see below), whose sum is σ = 89324352. Its totient is φ = 66993252.

The previous prime is 78158779. The next prime is 78158813. The reversal of 78158801 is 10885187.

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 78158801 - 2⁶ = 78158737 is a prime.

It is a super-2 number, since 2×78158801² = 12217596347515202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78158851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5582765 + ... + 5582778.

It is an arithmetic number, because the mean of its divisors is an integer number (22331088).

Almost surely, 2^78158801 is an apocalyptic number.

It is an amenable number.

78158801 is a deficient number, since it is larger than the sum of its proper divisors (11165551).

78158801 is a wasteful number, since it uses less digits than its factorization.

78158801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11165550.

The product of its (nonzero) digits is 17920, while the sum is 38.

The square root of 78158801 is about 8840.7466313655. The cubic root of 78158801 is about 427.5556299368. Note that the first 3 decimals are identical.

The spelling of 78158801 in words is "seventy-eight million, one hundred fifty-eight thousand, eight hundred one".