78223007 has 4 divisors (see below), whose sum is σ = 78915360. Its totient is φ = 77530656.

The previous prime is 78222997. The next prime is 78223021. The reversal of 78223007 is 70032287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70032287 = 13 ⋅5387099.

It is not a de Polignac number, because 78223007 - 2⁸ = 78222751 is a prime.

It is a super-2 number, since 2×78223007² = 12237677648244098, 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 (78223037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346007 + ... + 346232.

It is an arithmetic number, because the mean of its divisors is an integer number (19728840).

Almost surely, 2^78223007 is an apocalyptic number.

78223007 is a deficient number, since it is larger than the sum of its proper divisors (692353).

78223007 is a wasteful number, since it uses less digits than its factorization.

78223007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692352.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 78223007 is about 8844.3771403078. The cubic root of 78223007 is about 427.6726742229.

The spelling of 78223007 in words is "seventy-eight million, two hundred twenty-three thousand, seven".