77821452 has 24 divisors (see below), whose sum is σ = 201759600. Its totient is φ = 25940448.

The previous prime is 77821433. The next prime is 77821463. The reversal of 77821452 is 25412877.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360177 + ... + 360392.

It is an arithmetic number, because the mean of its divisors is an integer number (8406650).

Almost surely, 2^77821452 is an apocalyptic number.

It is an amenable number.

77821452 is an abundant number, since it is smaller than the sum of its proper divisors (123938148).

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

77821452 is a wasteful number, since it uses less digits than its factorization.

77821452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720582 (or 720574 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 77821452 is about 8821.6467850396. The cubic root of 77821452 is about 426.9396042824.

The spelling of 77821452 in words is "seventy-seven million, eight hundred twenty-one thousand, four hundred fifty-two".