99778540 has 12 divisors (see below), whose sum is σ = 209534976. Its totient is φ = 39911408.

The previous prime is 99778537. The next prime is 99778541. The reversal of 99778540 is 4587799.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (99778541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2494444 + ... + 2494483.

It is an arithmetic number, because the mean of its divisors is an integer number (17461248).

Almost surely, 2^99778540 is an apocalyptic number.

It is an amenable number.

99778540 is an abundant number, since it is smaller than the sum of its proper divisors (109756436).

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

99778540 is a wasteful number, since it uses less digits than its factorization.

99778540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4988936 (or 4988934 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 99778540 is about 9988.9208626358. The cubic root of 99778540 is about 463.8159880235.

The spelling of 99778540 in words is "ninety-nine million, seven hundred seventy-eight thousand, five hundred forty".