78422661 has 12 divisors (see below), whose sum is σ = 117472992. Its totient is φ = 52281612.

The previous prime is 78422651. The next prime is 78422711. The reversal of 78422661 is 16622487.

It is not a de Polignac number, because 78422661 - 2¹¹ = 78420613 is a prime.

It is a super-2 number, since 2×78422661² = 12300227516641842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78422651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161121 + ... + 161606.

It is an arithmetic number, because the mean of its divisors is an integer number (9789416).

Almost surely, 2^78422661 is an apocalyptic number.

It is an amenable number.

78422661 is a deficient number, since it is larger than the sum of its proper divisors (39050331).

78422661 is an equidigital number, since it uses as much as digits as its factorization.

78422661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322742 (or 322730 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 78422661 is about 8855.6570055530. The cubic root of 78422661 is about 428.0362246249.

The spelling of 78422661 in words is "seventy-eight million, four hundred twenty-two thousand, six hundred sixty-one".