78992005 has 16 divisors (see below), whose sum is σ = 99452160. Its totient is φ = 60115968.

The previous prime is 78991981. The next prime is 78992009. The reversal of 78992005 is 50029987.

It is a cyclic number.

It is not a de Polignac number, because 78992005 - 2¹³ = 78983813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78992009) 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, 20416 + ... + 23974.

It is an arithmetic number, because the mean of its divisors is an integer number (6215760).

Almost surely, 2^78992005 is an apocalyptic number.

It is an amenable number.

78992005 is a deficient number, since it is larger than the sum of its proper divisors (20460155).

78992005 is a wasteful number, since it uses less digits than its factorization.

78992005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 78992005 is about 8887.7446520476. The cubic root of 78992005 is about 429.0695674172.

The spelling of 78992005 in words is "seventy-eight million, nine hundred ninety-two thousand, five".