99660278 has 4 divisors (see below), whose sum is σ = 149490420. Its totient is φ = 49830138.

The previous prime is 99660271. The next prime is 99660293. The reversal of 99660278 is 87206699.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×99660278² = 19864342022074568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99660271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24915068 + ... + 24915071.

It is an arithmetic number, because the mean of its divisors is an integer number (37372605).

Almost surely, 2^99660278 is an apocalyptic number.

99660278 is a deficient number, since it is larger than the sum of its proper divisors (49830142).

99660278 is a wasteful number, since it uses less digits than its factorization.

99660278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49830141.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 99660278 is about 9982.9994490634. Note that the first 3 decimals coincide. The cubic root of 99660278 is about 463.6326704097.

The spelling of 99660278 in words is "ninety-nine million, six hundred sixty thousand, two hundred seventy-eight".