78152312204538 has 32 divisors (see below), whose sum is σ = 183630607699392. Its totient is φ = 21860786630400.

The previous prime is 78152312204531. The next prime is 78152312204557. The reversal of 78152312204538 is 83540221325187.

It is a super-2 number, since 2×78152312204538² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78152312204531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45543304623 + ... + 45543306338.

It is an arithmetic number, because the mean of its divisors is an integer number (5738456490606).

Almost surely, 2^{78152312204538} is an apocalyptic number.

78152312204538 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

78152312204538 is an abundant number, since it is smaller than the sum of its proper divisors (105478295494854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78152312204538 is a wasteful number, since it uses less digits than its factorization.

78152312204538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91086610990.

The product of its (nonzero) digits is 3225600, while the sum is 51.

The spelling of 78152312204538 in words is "seventy-eight trillion, one hundred fifty-two billion, three hundred twelve million, two hundred four thousand, five hundred thirty-eight".