99431782 has 4 divisors (see below), whose sum is σ = 149147676. Its totient is φ = 49715890.

The previous prime is 99431777. The next prime is 99431789. The reversal of 99431782 is 28713499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28713499 = 23 ⋅1248413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99431789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24857944 + ... + 24857947.

It is an arithmetic number, because the mean of its divisors is an integer number (37286919).

Almost surely, 2^99431782 is an apocalyptic number.

99431782 is a deficient number, since it is larger than the sum of its proper divisors (49715894).

99431782 is a wasteful number, since it uses less digits than its factorization.

99431782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49715893.

The product of its digits is 108864, while the sum is 43.

The square root of 99431782 is about 9971.5486259658. The cubic root of 99431782 is about 463.2780681572.

The spelling of 99431782 in words is "ninety-nine million, four hundred thirty-one thousand, seven hundred eighty-two".