77427797 has 4 divisors (see below), whose sum is σ = 77480160. Its totient is φ = 77375436.

The previous prime is 77427787. The next prime is 77427799. The reversal of 77427797 is 79772477.

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.

It is a cyclic number.

It is not a de Polignac number, because 77427797 - 2⁴ = 77427781 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 (77427799) 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, 23897 + ... + 26942.

It is an arithmetic number, because the mean of its divisors is an integer number (19370040).

Almost surely, 2^77427797 is an apocalyptic number.

It is an amenable number.

77427797 is a deficient number, since it is larger than the sum of its proper divisors (52363).

77427797 is a wasteful number, since it uses less digits than its factorization.

77427797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52362.

The product of its digits is 1210104, while the sum is 50.

The square root of 77427797 is about 8799.3066204105. The cubic root of 77427797 is about 426.2185045083.

The spelling of 77427797 in words is "seventy-seven million, four hundred twenty-seven thousand, seven hundred ninety-seven".