65420649 has 16 divisors (see below), whose sum is σ = 110765440. Its totient is φ = 37383120.

The previous prime is 65420623. The next prime is 65420659. The reversal of 65420649 is 94602456.

65420649 is a `hidden beast` number, since 6 + 5 + 4 + 2 + 0 + 649 = 666.

It is not a de Polignac number, because 65420649 - 2⁷ = 65420521 is a prime.

It is a super-2 number, since 2×65420649² = 8559722631162402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65420659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172882 + ... + 173259.

It is an arithmetic number, because the mean of its divisors is an integer number (6922840).

Almost surely, 2^65420649 is an apocalyptic number.

It is an amenable number.

65420649 is a deficient number, since it is larger than the sum of its proper divisors (45344791).

65420649 is a wasteful number, since it uses less digits than its factorization.

65420649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346157 (or 346151 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 65420649 is about 8088.3032213190. The cubic root of 65420649 is about 402.9380522029.

The spelling of 65420649 in words is "sixty-five million, four hundred twenty thousand, six hundred forty-nine".