495651640 has 64 divisors (see below), whose sum is σ = 1218900960. Its totient is φ = 179896320.

The previous prime is 495651631. The next prime is 495651649. The reversal of 495651640 is 46156594.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (495651631) and next prime (495651649).

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 = 495651593 and 495651602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (495651649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429304 + ... + 430456.

Almost surely, 2^495651640 is an apocalyptic number.

495651640 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 495651640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (609450480).

495651640 is an abundant number, since it is smaller than the sum of its proper divisors (723249320).

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

495651640 is a wasteful number, since it uses less digits than its factorization.

495651640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152 (or 2148 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 495651640 is about 22263.2351647284. The cubic root of 495651640 is about 791.3929598346.

The spelling of 495651640 in words is "four hundred ninety-five million, six hundred fifty-one thousand, six hundred forty".