78412073 has 4 divisors (see below), whose sum is σ = 78429840. Its totient is φ = 78394308.

The previous prime is 78412067. The next prime is 78412099. The reversal of 78412073 is 37021487.

It is a happy number.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 37021487 = 29 ⋅1276603.

It is a cyclic number.

It is not a de Polignac number, because 78412073 - 2¹⁰ = 78411049 is a prime.

It is a super-2 number, since 2×78412073² = 12296906384314658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78462073) 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, 3386 + ... + 12972.

It is an arithmetic number, because the mean of its divisors is an integer number (19607460).

Almost surely, 2^78412073 is an apocalyptic number.

It is an amenable number.

78412073 is a deficient number, since it is larger than the sum of its proper divisors (17767).

78412073 is an equidigital number, since it uses as much as digits as its factorization.

78412073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17766.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 78412073 is about 8855.0591754093. The cubic root of 78412073 is about 428.0169604162.

The spelling of 78412073 in words is "seventy-eight million, four hundred twelve thousand, seventy-three".