77609397 has 4 divisors (see below), whose sum is σ = 103479200. Its totient is φ = 51739596.

The previous prime is 77609393. The next prime is 77609419. The reversal of 77609397 is 79390677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79390677 = 3 ⋅26463559.

It is not a de Polignac number, because 77609397 - 2² = 77609393 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 (77609393) 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, 12934897 + ... + 12934902.

It is an arithmetic number, because the mean of its divisors is an integer number (25869800).

Almost surely, 2^77609397 is an apocalyptic number.

It is an amenable number.

77609397 is a deficient number, since it is larger than the sum of its proper divisors (25869803).

77609397 is a wasteful number, since it uses less digits than its factorization.

77609397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25869802.

The product of its (nonzero) digits is 500094, while the sum is 48.

The square root of 77609397 is about 8809.6195718090. The cubic root of 77609397 is about 426.5514635124.

The spelling of 77609397 in words is "seventy-seven million, six hundred nine thousand, three hundred ninety-seven".