78012069 has 4 divisors (see below), whose sum is σ = 104016096. Its totient is φ = 52008044.

The previous prime is 78012061. The next prime is 78012071. The reversal of 78012069 is 96021087.

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: 96021087 = 3 ⋅32007029.

It is a cyclic number.

It is not a de Polignac number, because 78012069 - 2³ = 78012061 is a prime.

It is a super-2 number, since 2×78012069² = 12171765819321522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78012061) 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, 13002009 + ... + 13002014.

It is an arithmetic number, because the mean of its divisors is an integer number (26004024).

Almost surely, 2^78012069 is an apocalyptic number.

It is an amenable number.

78012069 is a deficient number, since it is larger than the sum of its proper divisors (26004027).

78012069 is a wasteful number, since it uses less digits than its factorization.

78012069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26004026.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 78012069 is about 8832.4441124753. Note that the first 3 decimals coincide. The cubic root of 78012069 is about 427.2879040921.

It can be divided in two parts, 7801 and 2069, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 78012069 in words is "seventy-eight million, twelve thousand, sixty-nine".