454890640 has 20 divisors (see below), whose sum is σ = 1057620924. Its totient is φ = 181956224.

The previous prime is 454890599. The next prime is 454890643. The reversal of 454890640 is 46098454.

It can be written as a sum of positive squares in 2 ways, for example, as 165482496 + 289408144 = 12864^2 + 17012^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 = 454890593 and 454890602.

It is not an unprimeable number, because it can be changed into a prime (454890643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2842987 + ... + 2843146.

Almost surely, 2^454890640 is an apocalyptic number.

454890640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

454890640 is an abundant number, since it is smaller than the sum of its proper divisors (602730284).

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

454890640 is a wasteful number, since it uses less digits than its factorization.

454890640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5686146 (or 5686140 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 454890640 is about 21328.1654157126. The cubic root of 454890640 is about 769.0755420318.

The spelling of 454890640 in words is "four hundred fifty-four million, eight hundred ninety thousand, six hundred forty".