78373535858 has 4 divisors (see below), whose sum is σ = 117560303790. Its totient is φ = 39186767928.

The previous prime is 78373535857. The next prime is 78373535861. The reversal of 78373535858 is 85853537387.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85853537387 = 36787 ⋅2333801.

It can be written as a sum of positive squares in only one way, i.e., 71039840089 + 7333695769 = 266533^2 + 85637^2 .

It is a super-2 number, since 2×78373535858² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78373535858.

It is not an unprimeable number, because it can be changed into a prime (78373535857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19593383963 + ... + 19593383966.

Almost surely, 2^78373535858 is an apocalyptic number.

78373535858 is a deficient number, since it is larger than the sum of its proper divisors (39186767932).

78373535858 is a wasteful number, since it uses less digits than its factorization.

78373535858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39186767931.

The product of its digits is 84672000, while the sum is 62.

The spelling of 78373535858 in words is "seventy-eight billion, three hundred seventy-three million, five hundred thirty-five thousand, eight hundred fifty-eight".