78438700733 has 4 divisors (see below), whose sum is σ = 80262856608. Its totient is φ = 76614544860.

The previous prime is 78438700643. The next prime is 78438700751. The reversal of 78438700733 is 33700783487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78438700733 - 2²⁰ = 78437652157 is a prime.

It is a super-2 number, since 2×78438700733² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78438700793) 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, 912077873 + ... + 912077958.

It is an arithmetic number, because the mean of its divisors is an integer number (20065714152).

Almost surely, 2^78438700733 is an apocalyptic number.

It is an amenable number.

78438700733 is a deficient number, since it is larger than the sum of its proper divisors (1824155875).

78438700733 is a wasteful number, since it uses less digits than its factorization.

78438700733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824155874.

The product of its (nonzero) digits is 2370816, while the sum is 50.

The spelling of 78438700733 in words is "seventy-eight billion, four hundred thirty-eight million, seven hundred thousand, seven hundred thirty-three".