77047044 has 12 divisors (see below), whose sum is σ = 179776464. Its totient is φ = 25682344.

The previous prime is 77047039. The next prime is 77047049. The reversal of 77047044 is 44074077.

It is an interprime number because it is at equal distance from previous prime (77047039) and next prime (77047049).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 77046996 and 77047014.

It is not an unprimeable number, because it can be changed into a prime (77047049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3210282 + ... + 3210305.

It is an arithmetic number, because the mean of its divisors is an integer number (14981372).

Almost surely, 2^77047044 is an apocalyptic number.

It is an amenable number.

77047044 is an abundant number, since it is smaller than the sum of its proper divisors (102729420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77047044 is a wasteful number, since it uses less digits than its factorization.

77047044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6420594 (or 6420592 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 33.

The square root of 77047044 is about 8777.6445587640. The cubic root of 77047044 is about 425.5187096826.

Multiplying 77047044 by its sum of digits (33), we get a palindrome (2542552452).

Adding to 77047044 its reverse (44074077), we get a palindrome (121121121).

The spelling of 77047044 in words is "seventy-seven million, forty-seven thousand, forty-four".