78779751 has 16 divisors (see below), whose sum is σ = 112103424. Its totient is φ = 49037184.

The previous prime is 78779671. The next prime is 78779777. The reversal of 78779751 is 15797787.

It is a happy number.

It is not a de Polignac number, because 78779751 - 2¹¹ = 78777703 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 78779694 and 78779703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78779791) 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 15 ways as a sum of consecutive naturals, for example, 396 + ... + 12558.

It is an arithmetic number, because the mean of its divisors is an integer number (7006464).

Almost surely, 2^78779751 is an apocalyptic number.

78779751 is a deficient number, since it is larger than the sum of its proper divisors (33323673).

78779751 is a wasteful number, since it uses less digits than its factorization.

78779751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12310.

The product of its digits is 864360, while the sum is 51.

The square root of 78779751 is about 8875.7957953076. The cubic root of 78779751 is about 428.6849148825.

The spelling of 78779751 in words is "seventy-eight million, seven hundred seventy-nine thousand, seven hundred fifty-one".