6420735 has 32 divisors (see below), whose sum is σ = 11520000. Its totient is φ = 3392928.

The previous prime is 6420731. The next prime is 6420737. The reversal of 6420735 is 5370246.

It is a happy number.

It is not a de Polignac number, because 6420735 - 2² = 6420731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 6⁵ + 4¹¹ + 2²¹ + 0 + 7⁶ + 3⁶ + 5⁵ .

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 6420699 and 6420708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26746 + ... + 26984.

It is an arithmetic number, because the mean of its divisors is an integer number (360000).

Almost surely, 2^6420735 is an apocalyptic number.

6420735 is a deficient number, since it is larger than the sum of its proper divisors (5099265).

6420735 is a wasteful number, since it uses less digits than its factorization.

6420735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 6420735 is about 2533.9169283937. The cubic root of 6420735 is about 185.8638441640.

The spelling of 6420735 in words is "six million, four hundred twenty thousand, seven hundred thirty-five".