78328277837 has 4 divisors (see below), whose sum is σ = 78443977596. Its totient is φ = 78212578080.

The previous prime is 78328277821. The next prime is 78328277893. The reversal of 78328277837 is 73877282387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73877282387 = 919 ⋅80388773.

It can be written as a sum of positive squares in 2 ways, for example, as 55764933316 + 22563344521 = 236146^2 + 150211^2 .

It is a cyclic number.

It is not a de Polignac number, because 78328277837 - 2⁴ = 78328277821 is a prime.

It is a super-2 number, since 2×78328277837² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78328277837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78328277897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57848864 + ... + 57850217.

It is an arithmetic number, because the mean of its divisors is an integer number (19610994399).

Almost surely, 2^78328277837 is an apocalyptic number.

It is an amenable number.

78328277837 is a deficient number, since it is larger than the sum of its proper divisors (115699759).

78328277837 is a wasteful number, since it uses less digits than its factorization.

78328277837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115699758.

The product of its digits is 44255232, while the sum is 62.

The spelling of 78328277837 in words is "seventy-eight billion, three hundred twenty-eight million, two hundred seventy-seven thousand, eight hundred thirty-seven".