99722778 has 8 divisors (see below), whose sum is σ = 199445568. Its totient is φ = 33240924.

The previous prime is 99722761. The next prime is 99722863. The reversal of 99722778 is 87722799.

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

99722778 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 99722778.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8310226 + ... + 8310237.

It is an arithmetic number, because the mean of its divisors is an integer number (24930696).

Almost surely, 2^99722778 is an apocalyptic number.

99722778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99722778 is a wasteful number, since it uses less digits than its factorization.

99722778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16620468.

The product of its digits is 889056, while the sum is 51.

The square root of 99722778 is about 9986.1292801566. The cubic root of 99722778 is about 463.7295695526.

The spelling of 99722778 in words is "ninety-nine million, seven hundred twenty-two thousand, seven hundred seventy-eight".