78058777 has 4 divisors (see below), whose sum is σ = 78174756. Its totient is φ = 77942800.

The previous prime is 78058763. The next prime is 78058787. The reversal of 78058777 is 77785087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77785087 = 127 ⋅612481.

It can be written as a sum of positive squares in 2 ways, for example, as 70241161 + 7817616 = 8381^2 + 2796^2 .

It is a cyclic number.

It is not a de Polignac number, because 78058777 - 2¹⁹ = 77534489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78058777.

It is not an unprimeable number, because it can be changed into a prime (78058787) 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, 56974 + ... + 58327.

It is an arithmetic number, because the mean of its divisors is an integer number (19543689).

Almost surely, 2^78058777 is an apocalyptic number.

It is an amenable number.

78058777 is a deficient number, since it is larger than the sum of its proper divisors (115979).

78058777 is a wasteful number, since it uses less digits than its factorization.

78058777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115978.

The product of its (nonzero) digits is 768320, while the sum is 49.

The square root of 78058777 is about 8835.0878320479. The cubic root of 78058777 is about 427.3731634710.

The spelling of 78058777 in words is "seventy-eight million, fifty-eight thousand, seven hundred seventy-seven".