90870840 has 48 divisors (see below), whose sum is σ = 295331400. Its totient is φ = 24232128.

The previous prime is 90870839. The next prime is 90870847. The reversal of 90870840 is 4807809.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 90870795 and 90870804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90870847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125850 + ... + 126569.

Almost surely, 2^90870840 is an apocalyptic number.

90870840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

90870840 is an abundant number, since it is smaller than the sum of its proper divisors (204460560).

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

90870840 is a wasteful number, since it uses less digits than its factorization.

90870840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252436 (or 252429 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 90870840 is about 9532.6197868162. The cubic root of 90870840 is about 449.5812400619.

The spelling of 90870840 in words is "ninety million, eight hundred seventy thousand, eight hundred forty".