78221946 has 16 divisors (see below), whose sum is σ = 170666208. Its totient is φ = 23703600.

The previous prime is 78221893. The next prime is 78221951. The reversal of 78221946 is 64912287.

It is a super-2 number, since 2×78221946² = 12237345672053832, which contains 22 as substring.

It is an unprimeable number.

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, 592525 + ... + 592656.

It is an arithmetic number, because the mean of its divisors is an integer number (10666638).

Almost surely, 2^78221946 is an apocalyptic number.

78221946 is an abundant number, since it is smaller than the sum of its proper divisors (92444262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78221946 is a wasteful number, since it uses less digits than its factorization.

78221946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185197.

The product of its digits is 48384, while the sum is 39.

The square root of 78221946 is about 8844.3171584922. The cubic root of 78221946 is about 427.6707405942.

The spelling of 78221946 in words is "seventy-eight million, two hundred twenty-one thousand, nine hundred forty-six".