78223942 has 4 divisors (see below), whose sum is σ = 117335916. Its totient is φ = 39111970.

The previous prime is 78223927. The next prime is 78223961. The reversal of 78223942 is 24932287.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78223942² = 12237970204038728, which contains 22 as substring.

It is a plaindrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19555984 + ... + 19555987.

It is an arithmetic number, because the mean of its divisors is an integer number (29333979).

Almost surely, 2^78223942 is an apocalyptic number.

78223942 is a deficient number, since it is larger than the sum of its proper divisors (39111974).

78223942 is a wasteful number, since it uses less digits than its factorization.

78223942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39111973.

The product of its digits is 48384, while the sum is 37.

The square root of 78223942 is about 8844.4299985923. The cubic root of 78223942 is about 427.6743782073.

The spelling of 78223942 in words is "seventy-eight million, two hundred twenty-three thousand, nine hundred forty-two".