78218355233408 has 128 divisors (see below), whose sum is σ = 171725246985600. Its totient is φ = 35259086499840.

The previous prime is 78218355233339. The next prime is 78218355233413. The reversal of 78218355233408 is 80433255381287.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×78218355233408² (a number of 29 digits) contains 22 as substring.

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, 2182962053 + ... + 2182997883.

It is an arithmetic number, because the mean of its divisors is an integer number (1341603492075).

Almost surely, 2^{78218355233408} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78218355233408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85862623492800).

78218355233408 is an abundant number, since it is smaller than the sum of its proper divisors (93506891752192).

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

78218355233408 is a wasteful number, since it uses less digits than its factorization.

78218355233408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66410 (or 66398 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 59.

The spelling of 78218355233408 in words is "seventy-eight trillion, two hundred eighteen billion, three hundred fifty-five million, two hundred thirty-three thousand, four hundred eight".