78193153 has 4 divisors (see below), whose sum is σ = 78211008. Its totient is φ = 78175300.

The previous prime is 78193121. The next prime is 78193163. The reversal of 78193153 is 35139187.

It is a happy number.

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 78193153 - 2⁵ = 78193121 is a prime.

It is a super-2 number, since 2×78193153² = 12228338352162818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78193163) 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, 2628 + ... + 12778.

It is an arithmetic number, because the mean of its divisors is an integer number (19552752).

Almost surely, 2^78193153 is an apocalyptic number.

It is an amenable number.

78193153 is a deficient number, since it is larger than the sum of its proper divisors (17855).

78193153 is a wasteful number, since it uses less digits than its factorization.

78193153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17854.

The product of its digits is 22680, while the sum is 37.

The square root of 78193153 is about 8842.6892402707. The cubic root of 78193153 is about 427.6182598627.

The spelling of 78193153 in words is "seventy-eight million, one hundred ninety-three thousand, one hundred fifty-three".