498995640 has 384 divisors, whose sum is σ = 1981324800. Its totient is φ = 111352320.

The previous prime is 498995639. The next prime is 498995647. The reversal of 498995640 is 46599894.

498995640 is a `hidden beast` number, since 498 + 9 + 95 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (498995647) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1389781 + ... + 1390139.

It is an arithmetic number, because the mean of its divisors is an integer number (5159700).

Almost surely, 2^498995640 is an apocalyptic number.

498995640 is a gapful number since it is divisible by the number (40) 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 498995640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990662400).

498995640 is an abundant number, since it is smaller than the sum of its proper divisors (1482329160).

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

498995640 is a wasteful number, since it uses less digits than its factorization.

498995640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 498995640 is about 22338.2103132726. The cubic root of 498995640 is about 793.1687290411.

The spelling of 498995640 in words is "four hundred ninety-eight million, nine hundred ninety-five thousand, six hundred forty".