78222621 has 8 divisors (see below), whose sum is σ = 104540544. Its totient is φ = 52026560.

The previous prime is 78222619. The next prime is 78222637. The reversal of 78222621 is 12622287.

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 78222621 - 2¹ = 78222619 is a prime.

It is a super-2 number, since 2×78222621² = 12237556872219282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78222121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28956 + ... + 31541.

It is an arithmetic number, because the mean of its divisors is an integer number (13067568).

Almost surely, 2^78222621 is an apocalyptic number.

It is an amenable number.

78222621 is a deficient number, since it is larger than the sum of its proper divisors (26317923).

78222621 is a wasteful number, since it uses less digits than its factorization.

78222621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60931.

The product of its digits is 5376, while the sum is 30.

The square root of 78222621 is about 8844.3553185068. The cubic root of 78222621 is about 427.6719707558.

The spelling of 78222621 in words is "seventy-eight million, two hundred twenty-two thousand, six hundred twenty-one".