78945099 has 8 divisors (see below), whose sum is σ = 106345680. Its totient is φ = 52087296.

The previous prime is 78945029. The next prime is 78945107. The reversal of 78945099 is 99054987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78945099 - 2⁸ = 78944843 is a prime.

It is a super-2 number, since 2×78945099² = 12464657312239602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78945029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135354 + ... + 135935.

It is an arithmetic number, because the mean of its divisors is an integer number (13293210).

Almost surely, 2^78945099 is an apocalyptic number.

78945099 is a deficient number, since it is larger than the sum of its proper divisors (27400581).

78945099 is a wasteful number, since it uses less digits than its factorization.

78945099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271389.

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 78945099 is about 8885.1054580123. The cubic root of 78945099 is about 428.9846224404.

The spelling of 78945099 in words is "seventy-eight million, nine hundred forty-five thousand, ninety-nine".