84577621 has 4 divisors (see below), whose sum is σ = 86011200. Its totient is φ = 83144044.

The previous prime is 84577613. The next prime is 84577631. The reversal of 84577621 is 12677548.

It is the 3755-th star number.

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 84577621 - 2³ = 84577613 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84577631) 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, 716701 + ... + 716818.

It is an arithmetic number, because the mean of its divisors is an integer number (21502800).

Almost surely, 2^84577621 is an apocalyptic number.

It is an amenable number.

84577621 is a deficient number, since it is larger than the sum of its proper divisors (1433579).

84577621 is a wasteful number, since it uses less digits than its factorization.

84577621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433578.

The product of its digits is 94080, while the sum is 40.

The square root of 84577621 is about 9196.6092120955. The cubic root of 84577621 is about 438.9534718565.

The spelling of 84577621 in words is "eighty-four million, five hundred seventy-seven thousand, six hundred twenty-one".