78878877531502 has 4 divisors (see below), whose sum is σ = 118318316297256. Its totient is φ = 39439438765750.

The previous prime is 78878877531451. The next prime is 78878877531547. The reversal of 78878877531502 is 20513577887887.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19719719382874 + ... + 19719719382877.

It is an arithmetic number, because the mean of its divisors is an integer number (29579579074314).

Almost surely, 2^{78878877531502} is an apocalyptic number.

78878877531502 is a deficient number, since it is larger than the sum of its proper divisors (39439438765754).

78878877531502 is a wasteful number, since it uses less digits than its factorization.

78878877531502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39439438765753.

The product of its (nonzero) digits is 1475174400, while the sum is 76.

The spelling of 78878877531502 in words is "seventy-eight trillion, eight hundred seventy-eight billion, eight hundred seventy-seven million, five hundred thirty-one thousand, five hundred two".