78105321502 has 16 divisors (see below), whose sum is σ = 126527572080. Its totient is φ = 35946484992.

The previous prime is 78105321493. The next prime is 78105321523. The reversal of 78105321502 is 20512350187.

It is a super-2 number, since 2×78105321502² (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 in 7 ways as a sum of consecutive naturals, for example, 4245852 + ... + 4264207.

It is an arithmetic number, because the mean of its divisors is an integer number (7907973255).

Almost surely, 2^78105321502 is an apocalyptic number.

78105321502 is a deficient number, since it is larger than the sum of its proper divisors (48422250578).

78105321502 is a wasteful number, since it uses less digits than its factorization.

78105321502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8510427.

The product of its (nonzero) digits is 16800, while the sum is 34.

Adding to 78105321502 its reverse (20512350187), we get a palindrome (98617671689).

The spelling of 78105321502 in words is "seventy-eight billion, one hundred five million, three hundred twenty-one thousand, five hundred two".