77764949 has 4 divisors (see below), whose sum is σ = 77784960. Its totient is φ = 77744940.

The previous prime is 77764943. The next prime is 77764961. The reversal of 77764949 is 94946777.

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 77764949 - 2⁴ = 77764933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77764949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77764943) 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, 2087 + ... + 12644.

It is an arithmetic number, because the mean of its divisors is an integer number (19446240).

Almost surely, 2^77764949 is an apocalyptic number.

It is an amenable number.

77764949 is a deficient number, since it is larger than the sum of its proper divisors (20011).

77764949 is a wasteful number, since it uses less digits than its factorization.

77764949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20010.

The product of its digits is 2667168, while the sum is 53.

The square root of 77764949 is about 8818.4436835532. The cubic root of 77764949 is about 426.8362514213.

The spelling of 77764949 in words is "seventy-seven million, seven hundred sixty-four thousand, nine hundred forty-nine".