77748993 has 24 divisors (see below), whose sum is σ = 133930368. Its totient is φ = 42495552.

The previous prime is 77748977. The next prime is 77749027. The reversal of 77748993 is 39984777.

77748993 is a `hidden beast` number, since 7 + 77 + 489 + 93 = 666.

It is not a de Polignac number, because 77748993 - 2⁴ = 77748977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77748943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25380 + ... + 28277.

It is an arithmetic number, because the mean of its divisors is an integer number (5580432).

Almost surely, 2^77748993 is an apocalyptic number.

It is an amenable number.

77748993 is a deficient number, since it is larger than the sum of its proper divisors (56181375).

77748993 is a wasteful number, since it uses less digits than its factorization.

77748993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53693 (or 53690 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The square root of 77748993 is about 8817.5389423580. The cubic root of 77748993 is about 426.8070563269.

It can be divided in two parts, 777 and 48993, that added together give a triangular number (49770 = T₃₁₅).

The spelling of 77748993 in words is "seventy-seven million, seven hundred forty-eight thousand, nine hundred ninety-three".