64840426 has 48 divisors (see below), whose sum is σ = 120657600. Its totient is φ = 25982208.

The previous prime is 64840421. The next prime is 64840439. The reversal of 64840426 is 62404846.

It is a happy number.

It is a super-2 number, since 2×64840426² = 8408561687722952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64840391 and 64840400.

It is not an unprimeable number, because it can be changed into a prime (64840421) 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, 180435 + ... + 180793.

It is an arithmetic number, because the mean of its divisors is an integer number (2513700).

Almost surely, 2^64840426 is an apocalyptic number.

64840426 is a deficient number, since it is larger than the sum of its proper divisors (55817174).

64840426 is a wasteful number, since it uses less digits than its factorization.

64840426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 64840426 is about 8052.3553076103. The cubic root of 64840426 is about 401.7432789094.

The spelling of 64840426 in words is "sixty-four million, eight hundred forty thousand, four hundred twenty-six".