6420755 has 8 divisors (see below), whose sum is σ = 8405424. Its totient is φ = 4669600.

The previous prime is 6420737. The next prime is 6420763. The reversal of 6420755 is 5570246.

6420755 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-6420755 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58316 + ... + 58425.

It is an arithmetic number, because the mean of its divisors is an integer number (1050678).

Almost surely, 2^6420755 is an apocalyptic number.

6420755 is a deficient number, since it is larger than the sum of its proper divisors (1984669).

6420755 is a wasteful number, since it uses less digits than its factorization.

6420755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116757.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 6420755 is about 2533.9208748499. The cubic root of 6420755 is about 185.8640371467.

The spelling of 6420755 in words is "six million, four hundred twenty thousand, seven hundred fifty-five".