99971378 has 16 divisors (see below), whose sum is σ = 162266496. Its totient is φ = 45919440.

The previous prime is 99971371. The next prime is 99971413. The reversal of 99971378 is 87317999.

It is not an unprimeable number, because it can be changed into a prime (99971371) 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, 3626 + ... + 14597.

It is an arithmetic number, because the mean of its divisors is an integer number (10141656).

Almost surely, 2^99971378 is an apocalyptic number.

99971378 is a deficient number, since it is larger than the sum of its proper divisors (62295118).

99971378 is a wasteful number, since it uses less digits than its factorization.

99971378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18449.

The product of its digits is 857304, while the sum is 53.

The square root of 99971378 is about 9998.5687975830. The cubic root of 99971378 is about 464.1145952838.

The spelling of 99971378 in words is "ninety-nine million, nine hundred seventy-one thousand, three hundred seventy-eight".