78994481 has 4 divisors (see below), whose sum is σ = 79022592. Its totient is φ = 78966372.

The previous prime is 78994459. The next prime is 78994523. The reversal of 78994481 is 18449987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18449987 = 83 ⋅222289.

It is a cyclic number.

It is not a de Polignac number, because 78994481 - 2¹⁰ = 78993457 is a prime.

It is a super-2 number, since 2×78994481² = 12480256056918722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78994081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9305 + ... + 15638.

It is an arithmetic number, because the mean of its divisors is an integer number (19755648).

Almost surely, 2^78994481 is an apocalyptic number.

It is an amenable number.

78994481 is a deficient number, since it is larger than the sum of its proper divisors (28111).

78994481 is a wasteful number, since it uses less digits than its factorization.

78994481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28110.

The product of its digits is 580608, while the sum is 50.

The square root of 78994481 is about 8887.8839438868. The cubic root of 78994481 is about 429.0740504242.

The spelling of 78994481 in words is "seventy-eight million, nine hundred ninety-four thousand, four hundred eighty-one".