64990535 has 16 divisors (see below), whose sum is σ = 80922240. Its totient is φ = 50069760.

The previous prime is 64990531. The next prime is 64990543. The reversal of 64990535 is 53509946.

It is not a de Polignac number, because 64990535 - 2² = 64990531 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 64990492 and 64990501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64990531) 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, 14189 + ... + 18201.

It is an arithmetic number, because the mean of its divisors is an integer number (5057640).

Almost surely, 2^64990535 is an apocalyptic number.

64990535 is a deficient number, since it is larger than the sum of its proper divisors (15931705).

64990535 is a wasteful number, since it uses less digits than its factorization.

64990535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 64990535 is about 8061.6707325467. The cubic root of 64990535 is about 402.0530589273.

The spelling of 64990535 in words is "sixty-four million, nine hundred ninety thousand, five hundred thirty-five".