2215031640 has 64 divisors (see below), whose sum is σ = 6824705760. Its totient is φ = 574709760.

The previous prime is 2215031633. The next prime is 2215031653. The reversal of 2215031640 is 461305122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2215031640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245001 + ... + 253880.

Almost surely, 2^2215031640 is an apocalyptic number.

2215031640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2215031640 is an abundant number, since it is smaller than the sum of its proper divisors (4609674120).

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

2215031640 is a wasteful number, since it uses less digits than its factorization.

2215031640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498932 (or 498928 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2215031640 is about 47064.1226413496. The cubic root of 2215031640 is about 1303.5468506503.

Adding to 2215031640 its reverse (461305122), we get a palindrome (2676336762).

The spelling of 2215031640 in words is "two billion, two hundred fifteen million, thirty-one thousand, six hundred forty".