78202658217680 has 20 divisors (see below), whose sum is σ = 181821180356292. Its totient is φ = 31281063287040.

The previous prime is 78202658217667. The next prime is 78202658217683. The reversal of 78202658217680 is 8671285620287.

It can be written as a sum of positive squares in 2 ways, for example, as 59184895421584 + 19017762796096 = 7693172^2 + 4360936^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×78202658217680² (a number of 29 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78202658217683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488766613781 + ... + 488766613940.

Almost surely, 2^{78202658217680} is an apocalyptic number.

It is an amenable number.

78202658217680 is an abundant number, since it is smaller than the sum of its proper divisors (103618522138612).

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

78202658217680 is a wasteful number, since it uses less digits than its factorization.

78202658217680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977533227734 (or 977533227728 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 62.

The spelling of 78202658217680 in words is "seventy-eight trillion, two hundred two billion, six hundred fifty-eight million, two hundred seventeen thousand, six hundred eighty".