78552621 has 12 divisors (see below), whose sum is σ = 129674272. Its totient is φ = 44887176.

The previous prime is 78552601. The next prime is 78552629. The reversal of 78552621 is 12625587.

It is a happy number.

It is not a de Polignac number, because 78552621 - 2⁷ = 78552493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78552629) 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, 623371 + ... + 623496.

Almost surely, 2^78552621 is an apocalyptic number.

It is an amenable number.

78552621 is a deficient number, since it is larger than the sum of its proper divisors (51121651).

78552621 is a wasteful number, since it uses less digits than its factorization.

78552621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246880 (or 1246877 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 78552621 is about 8862.9916506787. The cubic root of 78552621 is about 428.2725376459.

The spelling of 78552621 in words is "seventy-eight million, five hundred fifty-two thousand, six hundred twenty-one".