99505780 has 48 divisors (see below), whose sum is σ = 228936960. Its totient is φ = 36028800.

The previous prime is 99505739. The next prime is 99505807. The reversal of 99505780 is 8750599.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58786 + ... + 60454.

It is an arithmetic number, because the mean of its divisors is an integer number (4769520).

Almost surely, 2^99505780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99505780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114468480).

99505780 is an abundant number, since it is smaller than the sum of its proper divisors (129431180).

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

99505780 is a wasteful number, since it uses less digits than its factorization.

99505780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1960 (or 1958 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 43.

The square root of 99505780 is about 9975.2583926433. The cubic root of 99505780 is about 463.3929648535.

The spelling of 99505780 in words is "ninety-nine million, five hundred five thousand, seven hundred eighty".