78157704023640 has 192 divisors, whose sum is σ = 255207351110400. Its totient is φ = 20744240645376.

The previous prime is 78157704023639. The next prime is 78157704023669. The reversal of 78157704023640 is 4632040775187.

78157704023640 is a `hidden beast` number, since 7 + 8 + 1 + 577 + 0 + 4 + 0 + 2 + 3 + 64 + 0 = 666.

It is a super-2 number, since 2×78157704023640² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67014367 + ... + 68170673.

It is an arithmetic number, because the mean of its divisors is an integer number (1329204953700).

Almost surely, 2^{78157704023640} 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 78157704023640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127603675555200).

78157704023640 is an abundant number, since it is smaller than the sum of its proper divisors (177049647086760).

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

78157704023640 is a wasteful number, since it uses less digits than its factorization.

78157704023640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157206 (or 1157199 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 54.

The spelling of 78157704023640 in words is "seventy-eight trillion, one hundred fifty-seven billion, seven hundred four million, twenty-three thousand, six hundred forty".