99775478 has 8 divisors (see below), whose sum is σ = 163269000. Its totient is φ = 45352480.

The previous prime is 99775469. The next prime is 99775547. The reversal of 99775478 is 87457799.

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

It is a congruent number.

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, 2267603 + ... + 2267646.

It is an arithmetic number, because the mean of its divisors is an integer number (20408625).

Almost surely, 2^99775478 is an apocalyptic number.

99775478 is a deficient number, since it is larger than the sum of its proper divisors (63493522).

99775478 is a wasteful number, since it uses less digits than its factorization.

99775478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535262.

The product of its digits is 4445280, while the sum is 56.

The square root of 99775478 is about 9988.7675916501. The cubic root of 99775478 is about 463.8112434526.

It can be divided in two parts, 99 and 775478, that added together give a palindrome (775577).

The spelling of 99775478 in words is "ninety-nine million, seven hundred seventy-five thousand, four hundred seventy-eight".