3640662450 has 84 divisors (see below), whose sum is σ = 10152905418. Its totient is φ = 970833600.

The previous prime is 3640662419. The next prime is 3640662461. The reversal of 3640662450 is 542660463.

3640662450 is a `hidden beast` number, since 3 + 6 + 406 + 6 + 245 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 3550848921 + 89813529 = 59589^2 + 9477^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 13491 + ... + 86390.

Almost surely, 2^3640662450 is an apocalyptic number.

3640662450 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3640662450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5076452709).

3640662450 is an abundant number, since it is smaller than the sum of its proper divisors (6512242968).

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

3640662450 is an equidigital number, since it uses as much as digits as its factorization.

3640662450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99911 (or 99891 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 3640662450 is about 60337.9022671488. The cubic root of 3640662450 is about 1538.3676482862.

The spelling of 3640662450 in words is "three billion, six hundred forty million, six hundred sixty-two thousand, four hundred fifty".