64690049 has 6 divisors (see below), whose sum is σ = 68719494. Its totient is φ = 60884480.

The previous prime is 64690037. The next prime is 64690057. The reversal of 64690049 is 94009646.

It can be written as a sum of positive squares in 3 ways, for example, as 6091024 + 58599025 = 2468^2 + 7655^2 .

It is not a de Polignac number, because 64690049 - 2¹⁶ = 64624513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64689994 and 64690021.

It is not an unprimeable number, because it can be changed into a prime (64690009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111632 + ... + 112209.

It is an arithmetic number, because the mean of its divisors is an integer number (11453249).

Almost surely, 2^64690049 is an apocalyptic number.

It is an amenable number.

64690049 is a deficient number, since it is larger than the sum of its proper divisors (4029445).

64690049 is a wasteful number, since it uses less digits than its factorization.

64690049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223875 (or 223858 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 64690049 is about 8043.0124331621. The cubic root of 64690049 is about 401.4324660621.

The spelling of 64690049 in words is "sixty-four million, six hundred ninety thousand, forty-nine".