78422667 has 4 divisors (see below), whose sum is σ = 104563560. Its totient is φ = 52281776.

The previous prime is 78422651. The next prime is 78422711. The reversal of 78422667 is 76622487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76622487 = 3 ⋅25540829.

It is a cyclic number.

It is not a de Polignac number, because 78422667 - 2⁴ = 78422651 is a prime.

It is a super-2 number, since 2×78422667² = 12300229398785778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78422167) 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, 13070442 + ... + 13070447.

It is an arithmetic number, because the mean of its divisors is an integer number (26140890).

Almost surely, 2^78422667 is an apocalyptic number.

78422667 is a deficient number, since it is larger than the sum of its proper divisors (26140893).

78422667 is a wasteful number, since it uses less digits than its factorization.

78422667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26140892.

The product of its digits is 225792, while the sum is 42.

The square root of 78422667 is about 8855.6573443195. The cubic root of 78422667 is about 428.0362355410.

The spelling of 78422667 in words is "seventy-eight million, four hundred twenty-two thousand, six hundred sixty-seven".