77398609 has 8 divisors (see below), whose sum is σ = 81568640. Its totient is φ = 73238256.

The previous prime is 77398577. The next prime is 77398621. The reversal of 77398609 is 90689377.

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 77398609 - 2⁵ = 77398577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77398649) 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, 18904 + ... + 22630.

It is an arithmetic number, because the mean of its divisors is an integer number (10196080).

Almost surely, 2^77398609 is an apocalyptic number.

It is an amenable number.

77398609 is a deficient number, since it is larger than the sum of its proper divisors (4170031).

77398609 is a wasteful number, since it uses less digits than its factorization.

77398609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4839.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 77398609 is about 8797.6479243034. The cubic root of 77398609 is about 426.1649405010.

The spelling of 77398609 in words is "seventy-seven million, three hundred ninety-eight thousand, six hundred nine".