78389079 has 16 divisors (see below), whose sum is σ = 111532800. Its totient is φ = 48828096.

The previous prime is 78389053. The next prime is 78389081. The reversal of 78389079 is 97098387.

It is a happy number.

It is not a de Polignac number, because 78389079 - 2¹¹ = 78387031 is a prime.

It is a super-2 number, since 2×78389079² = 12289695412936482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78389009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5259 + ... + 13580.

It is an arithmetic number, because the mean of its divisors is an integer number (6970800).

Almost surely, 2^78389079 is an apocalyptic number.

78389079 is a deficient number, since it is larger than the sum of its proper divisors (33143721).

78389079 is a wasteful number, since it uses less digits than its factorization.

78389079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18934.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 78389079 is about 8853.7607263806. The cubic root of 78389079 is about 427.9751182874.

The spelling of 78389079 in words is "seventy-eight million, three hundred eighty-nine thousand, seventy-nine".