77770397 has 8 divisors (see below), whose sum is σ = 78743616. Its totient is φ = 76803552.

The previous prime is 77770387. The next prime is 77770409. The reversal of 77770397 is 79307777.

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 77770397 - 2¹² = 77766301 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 (77770307) 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, 25793 + ... + 28649.

It is an arithmetic number, because the mean of its divisors is an integer number (9842952).

Almost surely, 2^77770397 is an apocalyptic number.

It is an amenable number.

77770397 is a deficient number, since it is larger than the sum of its proper divisors (973219).

77770397 is a wasteful number, since it uses less digits than its factorization.

77770397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187.

The product of its (nonzero) digits is 453789, while the sum is 47.

The square root of 77770397 is about 8818.7525761867. The cubic root of 77770397 is about 426.8462188493.

The spelling of 77770397 in words is "seventy-seven million, seven hundred seventy thousand, three hundred ninety-seven".