77388989 has 8 divisors (see below), whose sum is σ = 80028672. Its totient is φ = 74758320.

The previous prime is 77388973. The next prime is 77389001. The reversal of 77388989 is 98988377.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77388989 - 2⁴ = 77388973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77388959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18332 + ... + 22154.

It is an arithmetic number, because the mean of its divisors is an integer number (10003584).

Almost surely, 2^77388989 is an apocalyptic number.

It is an amenable number.

77388989 is a deficient number, since it is larger than the sum of its proper divisors (2639683).

77388989 is a wasteful number, since it uses less digits than its factorization.

77388989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507.

The product of its digits is 6096384, while the sum is 59.

The square root of 77388989 is about 8797.1011702719. The cubic root of 77388989 is about 426.1472835230.

The spelling of 77388989 in words is "seventy-seven million, three hundred eighty-eight thousand, nine hundred eighty-nine".