99781470 has 80 divisors (see below), whose sum is σ = 274114368. Its totient is φ = 26032320.

The previous prime is 99781463. The next prime is 99781481. The reversal of 99781470 is 7418799.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 36760 + ... + 39380.

Almost surely, 2^99781470 is an apocalyptic number.

99781470 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99781470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137057184).

99781470 is an abundant number, since it is smaller than the sum of its proper divisors (174332898).

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

99781470 is a wasteful number, since it uses less digits than its factorization.

99781470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687 (or 2678 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 99781470 is about 9989.0675240485. The cubic root of 99781470 is about 463.8205279695.

The spelling of 99781470 in words is "ninety-nine million, seven hundred eighty-one thousand, four hundred seventy".