77393977 has 4 divisors (see below), whose sum is σ = 78160356. Its totient is φ = 76627600.

The previous prime is 77393957. The next prime is 77393983. The reversal of 77393977 is 77939377.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75533481 + 1860496 = 8691^2 + 1364^2 .

It is a cyclic number.

It is not a de Polignac number, because 77393977 - 2¹¹ = 77391929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77393947) 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, 383038 + ... + 383239.

It is an arithmetic number, because the mean of its divisors is an integer number (19540089).

Almost surely, 2^77393977 is an apocalyptic number.

It is an amenable number.

77393977 is a deficient number, since it is larger than the sum of its proper divisors (766379).

77393977 is a wasteful number, since it uses less digits than its factorization.

77393977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766378.

The product of its digits is 1750329, while the sum is 52.

The square root of 77393977 is about 8797.3846681841. The cubic root of 77393977 is about 426.1564389038.

The spelling of 77393977 in words is "seventy-seven million, three hundred ninety-three thousand, nine hundred seventy-seven".