78991095 has 16 divisors (see below), whose sum is σ = 133820640. Its totient is φ = 39650304.

The previous prime is 78991093. The next prime is 78991097. The reversal of 78991095 is 59019987.

It is an interprime number because it is at equal distance from previous prime (78991093) and next prime (78991097).

It is not a de Polignac number, because 78991095 - 2¹ = 78991093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78991093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154630 + ... + 155139.

It is an arithmetic number, because the mean of its divisors is an integer number (8363790).

Almost surely, 2^78991095 is an apocalyptic number.

78991095 is a deficient number, since it is larger than the sum of its proper divisors (54829545).

78991095 is a wasteful number, since it uses less digits than its factorization.

78991095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309794.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 78991095 is about 8887.6934578101. The cubic root of 78991095 is about 429.0679197618.

The spelling of 78991095 in words is "seventy-eight million, nine hundred ninety-one thousand, ninety-five".