78328678502 has 4 divisors (see below), whose sum is σ = 117493017756. Its totient is φ = 39164339250.

The previous prime is 78328678487. The next prime is 78328678567. The reversal of 78328678502 is 20587682387.

It is a happy number.

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

It is a super-2 number, since 2×78328678502² (a number of 23 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 as a sum of consecutive naturals, namely, 19582169624 + ... + 19582169627.

It is an arithmetic number, because the mean of its divisors is an integer number (29373254439).

Almost surely, 2^78328678502 is an apocalyptic number.

78328678502 is a deficient number, since it is larger than the sum of its proper divisors (39164339254).

78328678502 is a wasteful number, since it uses less digits than its factorization.

78328678502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39164339253.

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 78328678502 in words is "seventy-eight billion, three hundred twenty-eight million, six hundred seventy-eight thousand, five hundred two".