78378622738 has 16 divisors (see below), whose sum is σ = 132116475456. Its totient is φ = 34601933520.

The previous prime is 78378622717. The next prime is 78378622793. The reversal of 78378622738 is 83722687387.

It is a super-2 number, since 2×78378622738² (a number of 23 digits) contains 22 as substring.

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, 65533368 + ... + 65534563.

It is an arithmetic number, because the mean of its divisors is an integer number (8257279716).

Almost surely, 2^78378622738 is an apocalyptic number.

78378622738 is a deficient number, since it is larger than the sum of its proper divisors (53737852718).

78378622738 is a wasteful number, since it uses less digits than its factorization.

78378622738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131067969.

The product of its digits is 37933056, while the sum is 61.

The spelling of 78378622738 in words is "seventy-eight billion, three hundred seventy-eight million, six hundred twenty-two thousand, seven hundred thirty-eight".