890641840 has 40 divisors (see below), whose sum is σ = 2258993808. Its totient is φ = 323869440.

The previous prime is 890641831. The next prime is 890641841. The reversal of 890641840 is 48146098.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 890641793 and 890641802.

It is not an unprimeable number, because it can be changed into a prime (890641841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505167 + ... + 506926.

Almost surely, 2^890641840 is an apocalyptic number.

890641840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

890641840 is an abundant number, since it is smaller than the sum of its proper divisors (1368351968).

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

890641840 is a wasteful number, since it uses less digits than its factorization.

890641840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012117 (or 1012111 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 890641840 is about 29843.6231044423. The cubic root of 890641840 is about 962.1313467584.

The spelling of 890641840 in words is "eight hundred ninety million, six hundred forty-one thousand, eight hundred forty".