78236636425838 has 32 divisors (see below), whose sum is σ = 131001975941760. Its totient is φ = 34734791014560.

The previous prime is 78236636425823. The next prime is 78236636425847. The reversal of 78236636425838 is 83852463663287.

It is a super-2 number, since 2×78236636425838² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144995633 + ... + 145534211.

It is an arithmetic number, because the mean of its divisors is an integer number (4093811748180).

Almost surely, 2^{78236636425838} is an apocalyptic number.

78236636425838 is a deficient number, since it is larger than the sum of its proper divisors (52765339515922).

78236636425838 is a wasteful number, since it uses less digits than its factorization.

78236636425838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692192.

The product of its digits is 1672151040, while the sum is 71.

The spelling of 78236636425838 in words is "seventy-eight trillion, two hundred thirty-six billion, six hundred thirty-six million, four hundred twenty-five thousand, eight hundred thirty-eight".