64705961 has 4 divisors (see below), whose sum is σ = 68512212. Its totient is φ = 60899712.

The previous prime is 64705957. The next prime is 64705999. The reversal of 64705961 is 16950746.

64705961 = 1363² + 1364² + ... + 1396².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50410000 + 14295961 = 7100^2 + 3781^2 .

It is not a de Polignac number, because 64705961 - 2² = 64705957 is a prime.

It is a super-2 number, since 2×64705961² = 8373722777867042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64701961) 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, 1903100 + ... + 1903133.

It is an arithmetic number, because the mean of its divisors is an integer number (17128053).

Almost surely, 2^64705961 is an apocalyptic number.

It is an amenable number.

64705961 is a deficient number, since it is larger than the sum of its proper divisors (3806251).

64705961 is a wasteful number, since it uses less digits than its factorization.

64705961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806250.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 64705961 is about 8044.0015539531. The cubic root of 64705961 is about 401.4653772020.

The spelling of 64705961 in words is "sixty-four million, seven hundred five thousand, nine hundred sixty-one".