77321448 has 24 divisors (see below), whose sum is σ = 209412450. Its totient is φ = 25773792.

The previous prime is 77321443. The next prime is 77321467. The reversal of 77321448 is 84412377.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 61496964 + 15824484 = 7842^2 + 3978^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (77321441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 536883 + ... + 537026.

Almost surely, 2^77321448 is an apocalyptic number.

It is an amenable number.

77321448 is an abundant number, since it is smaller than the sum of its proper divisors (132091002).

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

77321448 is a wasteful number, since it uses less digits than its factorization.

77321448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073921 (or 1073914 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 77321448 is about 8793.2615109526. The cubic root of 77321448 is about 426.0232745334.

It can be divided in two parts, 7732 and 1448, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 77321448 in words is "seventy-seven million, three hundred twenty-one thousand, four hundred forty-eight".