64840937 has 4 divisors (see below), whose sum is σ = 74103936. Its totient is φ = 55577940.

The previous prime is 64840931. The next prime is 64840943. The reversal of 64840937 is 73904846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73904846 = 2 ⋅36952423.

It is an interprime number because it is at equal distance from previous prime (64840931) and next prime (64840943).

It is a cyclic number.

It is not a de Polignac number, because 64840937 - 2⁸ = 64840681 is a prime.

It is a super-2 number, since 2×64840937² = 8408694222075938, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64840894 and 64840903.

It is not an unprimeable number, because it can be changed into a prime (64840931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4631489 + ... + 4631502.

It is an arithmetic number, because the mean of its divisors is an integer number (18525984).

Almost surely, 2^64840937 is an apocalyptic number.

It is an amenable number.

64840937 is a deficient number, since it is larger than the sum of its proper divisors (9262999).

64840937 is an equidigital number, since it uses as much as digits as its factorization.

64840937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9262998.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 64840937 is about 8052.3870373946. The cubic root of 64840937 is about 401.7443342709.

The spelling of 64840937 in words is "sixty-four million, eight hundred forty thousand, nine hundred thirty-seven".