77955397 has 8 divisors (see below), whose sum is σ = 84029400. Its totient is φ = 71892480.

The previous prime is 77955389. The next prime is 77955403. The reversal of 77955397 is 79355977.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 57121 + 77898276 = 239^2 + 8826^2 .

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 77955397 - 2³ = 77955389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77955497) 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, 17229 + ... + 21277.

It is an arithmetic number, because the mean of its divisors is an integer number (10503675).

Almost surely, 2^77955397 is an apocalyptic number.

It is an amenable number.

77955397 is a deficient number, since it is larger than the sum of its proper divisors (6074003).

77955397 is a wasteful number, since it uses less digits than its factorization.

77955397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5543.

The product of its digits is 2083725, while the sum is 52.

The square root of 77955397 is about 8829.2353576060. The cubic root of 77955397 is about 427.1844110193.

The spelling of 77955397 in words is "seventy-seven million, nine hundred fifty-five thousand, three hundred ninety-seven".