89139840 has 128 divisors (see below), whose sum is σ = 300957120. Its totient is φ = 22364160.

The previous prime is 89139839. The next prime is 89139859. The reversal of 89139840 is 4893198.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×89139840² = 15891822150451200, which contains 22 as substring.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 89139792 and 89139801.

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, 31275 + ... + 34005.

Almost surely, 2^89139840 is an apocalyptic number.

89139840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 89139840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150478560).

89139840 is an abundant number, since it is smaller than the sum of its proper divisors (211817280).

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

89139840 is a wasteful number, since it uses less digits than its factorization.

89139840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2770 (or 2758 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 89139840 is about 9441.3897282127. The cubic root of 89139840 is about 446.7082261273.

The spelling of 89139840 in words is "eighty-nine million, one hundred thirty-nine thousand, eight hundred forty".