2640487 has 8 divisors (see below), whose sum is σ = 2869760. Its totient is φ = 2420280.

The previous prime is 2640409. The next prime is 2640497. The reversal of 2640487 is 7840462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2640487 - 2¹⁹ = 2116199 is a prime.

It is a super-4 number, since 4×2640487⁴ (a number of 27 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a d-powerful number, because it can be written as 2¹⁹ + 6⁴ + 4⁵ + 0 + 4⁷ + 8⁷ + 7³ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1653 + ... + 2830.

It is an arithmetic number, because the mean of its divisors is an integer number (358720).

2^2640487 is an apocalyptic number.

2640487 is a deficient number, since it is larger than the sum of its proper divisors (229273).

2640487 is a wasteful number, since it uses less digits than its factorization.

2640487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4533.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 2640487 is about 1624.9575379068. The cubic root of 2640487 is about 138.2169625022.

The spelling of 2640487 in words is "two million, six hundred forty thousand, four hundred eighty-seven".