77420449 has 4 divisors (see below), whose sum is σ = 78732720. Its totient is φ = 76108180.

The previous prime is 77420419. The next prime is 77420467. The reversal of 77420449 is 94402477.

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 77420449 - 2¹¹ = 77418401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77420419) 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, 656047 + ... + 656164.

It is an arithmetic number, because the mean of its divisors is an integer number (19683180).

Almost surely, 2^77420449 is an apocalyptic number.

It is an amenable number.

77420449 is a deficient number, since it is larger than the sum of its proper divisors (1312271).

77420449 is a wasteful number, since it uses less digits than its factorization.

77420449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312270.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 77420449 is about 8798.8890776052. The cubic root of 77420449 is about 426.2050211825.

The spelling of 77420449 in words is "seventy-seven million, four hundred twenty thousand, four hundred forty-nine".