78227621 has 8 divisors (see below), whose sum is σ = 80356320. Its totient is φ = 76113072.

The previous prime is 78227609. The next prime is 78227627. The reversal of 78227621 is 12672287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78227621 - 2¹⁰ = 78226597 is a prime.

It is a super-2 number, since 2×78227621² = 12239121374639282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78227627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8186 + ... + 14948.

It is an arithmetic number, because the mean of its divisors is an integer number (10044540).

Almost surely, 2^78227621 is an apocalyptic number.

It is an amenable number.

78227621 is a deficient number, since it is larger than the sum of its proper divisors (2128699).

78227621 is a wasteful number, since it uses less digits than its factorization.

78227621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7075.

The product of its digits is 18816, while the sum is 35.

The square root of 78227621 is about 8844.6379801550. The cubic root of 78227621 is about 427.6810828442.

The spelling of 78227621 in words is "seventy-eight million, two hundred twenty-seven thousand, six hundred twenty-one".