78238373177 has 8 divisors (see below), whose sum is σ = 81683814336. Its totient is φ = 74796579792.

The previous prime is 78238373137. The next prime is 78238373183. The reversal of 78238373177 is 77137383287.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78238373177 - 2²⁰ = 78237324601 is a prime.

It is a super-2 number, since 2×78238373177² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78238373117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868058 + ... + 953939.

It is an arithmetic number, because the mean of its divisors is an integer number (10210476792).

Almost surely, 2^78238373177 is an apocalyptic number.

It is an amenable number.

78238373177 is a deficient number, since it is larger than the sum of its proper divisors (3445441159).

78238373177 is a wasteful number, since it uses less digits than its factorization.

78238373177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823887.

The product of its digits is 8297856, while the sum is 56.

The spelling of 78238373177 in words is "seventy-eight billion, two hundred thirty-eight million, three hundred seventy-three thousand, one hundred seventy-seven".