77206397 has 4 divisors (see below), whose sum is σ = 78515040. Its totient is φ = 75897756.

The previous prime is 77206373. The next prime is 77206411. The reversal of 77206397 is 79360277.

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: 79360277 = 2029 ⋅39113.

It is a cyclic number.

It is not a de Polignac number, because 77206397 - 2¹⁸ = 76944253 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 (77206307) 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, 654233 + ... + 654350.

It is an arithmetic number, because the mean of its divisors is an integer number (19628760).

Almost surely, 2^77206397 is an apocalyptic number.

It is an amenable number.

77206397 is a deficient number, since it is larger than the sum of its proper divisors (1308643).

77206397 is a wasteful number, since it uses less digits than its factorization.

77206397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308642.

The product of its (nonzero) digits is 111132, while the sum is 41.

The square root of 77206397 is about 8786.7170774983. The cubic root of 77206397 is about 425.8118681876.

The spelling of 77206397 in words is "seventy-seven million, two hundred six thousand, three hundred ninety-seven".