78433149 has 4 divisors (see below), whose sum is σ = 104577536. Its totient is φ = 52288764.

The previous prime is 78433111. The next prime is 78433181. The reversal of 78433149 is 94133487.

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.

It is not a de Polignac number, because 78433149 - 2¹² = 78429053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78433109) 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, 13072189 + ... + 13072194.

It is an arithmetic number, because the mean of its divisors is an integer number (26144384).

Almost surely, 2^78433149 is an apocalyptic number.

It is an amenable number.

78433149 is a deficient number, since it is larger than the sum of its proper divisors (26144387).

78433149 is a wasteful number, since it uses less digits than its factorization.

78433149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26144386.

The product of its digits is 72576, while the sum is 39.

The square root of 78433149 is about 8856.2491496118. The cubic root of 78433149 is about 428.0553051804.

It can be divided in two parts, 784 and 33149, that added together give a palindrome (33933).

The spelling of 78433149 in words is "seventy-eight million, four hundred thirty-three thousand, one hundred forty-nine".