78077743 has 6 divisors (see below), whose sum is σ = 79382472. Its totient is φ = 76794120.

The previous prime is 78077731. The next prime is 78077749. The reversal of 78077743 is 34777087.

It is not a de Polignac number, because 78077743 - 2²¹ = 75980591 is a prime.

It is a super-2 number, since 2×78077743² = 12192267903948098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78077743.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78077749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6771 + ... + 14212.

It is an arithmetic number, because the mean of its divisors is an integer number (13230412).

Almost surely, 2^78077743 is an apocalyptic number.

78077743 is a deficient number, since it is larger than the sum of its proper divisors (1304729).

78077743 is an equidigital number, since it uses as much as digits as its factorization.

78077743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21105 (or 21044 counting only the distinct ones).

The product of its (nonzero) digits is 230496, while the sum is 43.

The square root of 78077743 is about 8836.1611008401. The cubic root of 78077743 is about 427.4077737282.

The spelling of 78077743 in words is "seventy-eight million, seventy-seven thousand, seven hundred forty-three".