99999478 has 4 divisors (see below), whose sum is σ = 149999220. Its totient is φ = 49999738.

The previous prime is 99999439. The next prime is 99999481. The reversal of 99999478 is 87499999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87499999 = 107 ⋅817757.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999868 + ... + 24999871.

It is an arithmetic number, because the mean of its divisors is an integer number (37499805).

Almost surely, 2^99999478 is an apocalyptic number.

99999478 is a deficient number, since it is larger than the sum of its proper divisors (49999742).

99999478 is a wasteful number, since it uses less digits than its factorization.

99999478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49999741.

The product of its digits is 13226976, while the sum is 64.

The square root of 99999478 is about 9999.9738999659. The cubic root of 99999478 is about 464.1580757234.

The spelling of 99999478 in words is "ninety-nine million, nine hundred ninety-nine thousand, four hundred seventy-eight".