77601391 has 8 divisors (see below), whose sum is σ = 88743200. Its totient is φ = 66473568.

The previous prime is 77601323. The next prime is 77601427. The reversal of 77601391 is 19310677.

It is a happy number.

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

It is not a de Polignac number, because 77601391 - 2⁹ = 77600879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77604391) 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, 14785 + ... + 19333.

It is an arithmetic number, because the mean of its divisors is an integer number (11092900).

Almost surely, 2^77601391 is an apocalyptic number.

77601391 is a deficient number, since it is larger than the sum of its proper divisors (11141809).

77601391 is a wasteful number, since it uses less digits than its factorization.

77601391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6993.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 77601391 is about 8809.1651704347. The cubic root of 77601391 is about 426.5367956647.

The spelling of 77601391 in words is "seventy-seven million, six hundred one thousand, three hundred ninety-one".