99771864 has 32 divisors (see below), whose sum is σ = 254139120. Its totient is φ = 32629376.

The previous prime is 99771863. The next prime is 99771949. The reversal of 99771864 is 46817799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99771863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37947 + ... + 40490.

Almost surely, 2^99771864 is an apocalyptic number.

It is an amenable number.

99771864 is an abundant number, since it is smaller than the sum of its proper divisors (154367256).

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

99771864 is a wasteful number, since it uses less digits than its factorization.

99771864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78499 (or 78495 counting only the distinct ones).

The product of its digits is 762048, while the sum is 51.

The square root of 99771864 is about 9988.5866868141. The cubic root of 99771864 is about 463.8056434324.

The spelling of 99771864 in words is "ninety-nine million, seven hundred seventy-one thousand, eight hundred sixty-four".