78822621 has 12 divisors (see below), whose sum is σ = 119847520. Its totient is φ = 49782600.

The previous prime is 78822599. The next prime is 78822631. The reversal of 78822621 is 12622887.

It is a happy number.

78822621 is a `hidden beast` number, since 7 + 8 + 8 + 22 + 621 = 666.

It is not a de Polignac number, because 78822621 - 2⁵ = 78822589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78822631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230305 + ... + 230646.

Almost surely, 2^78822621 is an apocalyptic number.

It is an amenable number.

78822621 is a deficient number, since it is larger than the sum of its proper divisors (41024899).

78822621 is a wasteful number, since it uses less digits than its factorization.

78822621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460976 (or 460973 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 78822621 is about 8878.2104615739. The cubic root of 78822621 is about 428.7626607056.

It can be divided in two parts, 788 and 22621, that added together give a square (23409 = 153²).

The spelling of 78822621 in words is "seventy-eight million, eight hundred twenty-two thousand, six hundred twenty-one".