99870780 has 48 divisors (see below), whose sum is σ = 289285920. Its totient is φ = 25713408.

The previous prime is 99870779. The next prime is 99870781. The reversal of 99870780 is 8707899.

It is an interprime number because it is at equal distance from previous prime (99870779) and next prime (99870781).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99870781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26959 + ... + 30438.

It is an arithmetic number, because the mean of its divisors is an integer number (6026790).

Almost surely, 2^99870780 is an apocalyptic number.

It is an amenable number.

99870780 is an abundant number, since it is smaller than the sum of its proper divisors (189415140).

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

99870780 is a wasteful number, since it uses less digits than its factorization.

99870780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57438 (or 57436 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 99870780 is about 9993.5369114243. The cubic root of 99870780 is about 463.9588684804.

It can be divided in two parts, 9 and 9870780, that added together give a palindrome (9870789).

The spelling of 99870780 in words is "ninety-nine million, eight hundred seventy thousand, seven hundred eighty".