78191922 has 24 divisors (see below), whose sum is σ = 157708656. Its totient is φ = 25844944.

The previous prime is 78191921. The next prime is 78191923. The reversal of 78191922 is 22919187.

It is an interprime number because it is at equal distance from previous prime (78191921) and next prime (78191923).

It is a super-2 number, since 2×78191922² = 12227953332108168, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78191921) 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, 132913 + ... + 133499.

It is an arithmetic number, because the mean of its divisors is an integer number (6571194).

Almost surely, 2^78191922 is an apocalyptic number.

78191922 is an abundant number, since it is smaller than the sum of its proper divisors (79516734).

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

78191922 is a wasteful number, since it uses less digits than its factorization.

78191922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890 (or 741 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The square root of 78191922 is about 8842.6196344748. The cubic root of 78191922 is about 427.6160158433.

The spelling of 78191922 in words is "seventy-eight million, one hundred ninety-one thousand, nine hundred twenty-two".