78022751 has 4 divisors (see below), whose sum is σ = 80131512. Its totient is φ = 75913992.

The previous prime is 78022729. The next prime is 78022781. The reversal of 78022751 is 15722087.

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

It is a cyclic number.

It is not a de Polignac number, because 78022751 - 2¹⁴ = 78006367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78022781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1054325 + ... + 1054398.

It is an arithmetic number, because the mean of its divisors is an integer number (20032878).

Almost surely, 2^78022751 is an apocalyptic number.

78022751 is a deficient number, since it is larger than the sum of its proper divisors (2108761).

78022751 is a wasteful number, since it uses less digits than its factorization.

78022751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108760.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 78022751 is about 8833.0487941594. The cubic root of 78022751 is about 427.3074056946.

The spelling of 78022751 in words is "seventy-eight million, twenty-two thousand, seven hundred fifty-one".