99214978 has 4 divisors (see below), whose sum is σ = 148822470. Its totient is φ = 49607488.

The previous prime is 99214949. The next prime is 99214987. The reversal of 99214978 is 87941299.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87941299 = 79 ⋅1113181.

It can be written as a sum of positive squares in only one way, i.e., 54952569 + 44262409 = 7413^2 + 6653^2 .

It is a super-2 number, since 2×99214978² = 19687223719080968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24803743 + ... + 24803746.

Almost surely, 2^99214978 is an apocalyptic number.

99214978 is a deficient number, since it is larger than the sum of its proper divisors (49607492).

99214978 is a wasteful number, since it uses less digits than its factorization.

99214978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49607491.

The product of its digits is 326592, while the sum is 49.

The square root of 99214978 is about 9960.6715637049. The cubic root of 99214978 is about 462.9411080626.

The spelling of 99214978 in words is "ninety-nine million, two hundred fourteen thousand, nine hundred seventy-eight".