78000051 has 4 divisors (see below), whose sum is σ = 104000072. Its totient is φ = 52000032.

The previous prime is 78000049. The next prime is 78000059. The reversal of 78000051 is 15000087.

It is a happy number.

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

It is not a de Polignac number, because 78000051 - 2¹ = 78000049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77999991 and 78000027.

It is not an unprimeable number, because it can be changed into a prime (78000059) 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, 13000006 + ... + 13000011.

It is an arithmetic number, because the mean of its divisors is an integer number (26000018).

Almost surely, 2^78000051 is an apocalyptic number.

78000051 is a deficient number, since it is larger than the sum of its proper divisors (26000021).

78000051 is a wasteful number, since it uses less digits than its factorization.

78000051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26000020.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 78000051 is about 8831.7637536338. The cubic root of 78000051 is about 427.2659612918.

The spelling of 78000051 in words is "seventy-eight million, fifty-one", and thus it is an aban number and an uban number.