78287655700 has 36 divisors (see below), whose sum is σ = 170276649340. Its totient is φ = 31242723840.

The previous prime is 78287655679. The next prime is 78287655703. The reversal of 78287655700 is 755678287.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 11457133444 + 66830522256 = 107038^2 + 258516^2 .

It is a super-2 number, since 2×78287655700² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78287655703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 860715 + ... + 947314.

Almost surely, 2^78287655700 is an apocalyptic number.

It is an amenable number.

78287655700 is an abundant number, since it is smaller than the sum of its proper divisors (91988993640).

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

78287655700 is a wasteful number, since it uses less digits than its factorization.

78287655700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808476 (or 1808469 counting only the distinct ones).

The product of its (nonzero) digits is 6585600, while the sum is 55.

The spelling of 78287655700 in words is "seventy-eight billion, two hundred eighty-seven million, six hundred fifty-five thousand, seven hundred".