6720987 has 24 divisors (see below), whose sum is σ = 11229456. Its totient is φ = 3544128.

The previous prime is 6720947. The next prime is 6721009. The reversal of 6720987 is 7890276.

It is not a de Polignac number, because 6720987 - 2⁸ = 6720731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6720947) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 153 + ... + 3669.

It is an arithmetic number, because the mean of its divisors is an integer number (467894).

Almost surely, 2^6720987 is an apocalyptic number.

6720987 is a deficient number, since it is larger than the sum of its proper divisors (4508469).

6720987 is a wasteful number, since it uses less digits than its factorization.

6720987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547 (or 3540 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 6720987 is about 2592.4866441315. The cubic root of 6720987 is about 188.7169975778.

The spelling of 6720987 in words is "six million, seven hundred twenty thousand, nine hundred eighty-seven".