64902689 has 4 divisors (see below), whose sum is σ = 68318640. Its totient is φ = 61486740.

The previous prime is 64902671. The next prime is 64902697. The reversal of 64902689 is 98620946.

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.

It is a cyclic number.

It is not a de Polignac number, because 64902689 - 2¹⁶ = 64837153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64908689) 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, 1707947 + ... + 1707984.

It is an arithmetic number, because the mean of its divisors is an integer number (17079660).

Almost surely, 2^64902689 is an apocalyptic number.

It is an amenable number.

64902689 is a deficient number, since it is larger than the sum of its proper divisors (3415951).

64902689 is a wasteful number, since it uses less digits than its factorization.

64902689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415950.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 64902689 is about 8056.2205158498. The cubic root of 64902689 is about 401.8718290599.

The spelling of 64902689 in words is "sixty-four million, nine hundred two thousand, six hundred eighty-nine".