77890049 has 4 divisors (see below), whose sum is σ = 78114864. Its totient is φ = 77665236.

The previous prime is 77889997. The next prime is 77890061. The reversal of 77890049 is 94009877.

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 77890049 - 2¹² = 77885953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77889991 and 77890009.

It is not an unprimeable number, because it can be changed into a prime (77890079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111887 + ... + 112580.

It is an arithmetic number, because the mean of its divisors is an integer number (19528716).

Almost surely, 2^77890049 is an apocalyptic number.

It is an amenable number.

77890049 is a deficient number, since it is larger than the sum of its proper divisors (224815).

77890049 is a wasteful number, since it uses less digits than its factorization.

77890049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224814.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 77890049 is about 8825.5339215257. The cubic root of 77890049 is about 427.0650117563.

The spelling of 77890049 in words is "seventy-seven million, eight hundred ninety thousand, forty-nine".