64240690 has 8 divisors (see below), whose sum is σ = 115633260. Its totient is φ = 25696272.

The previous prime is 64240651. The next prime is 64240699. The reversal of 64240690 is 9604246.

64240690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 61921161 + 2319529 = 7869^2 + 1523^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×64240690² = 8253732503352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64240699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3212025 + ... + 3212044.

Almost surely, 2^64240690 is an apocalyptic number.

64240690 is a deficient number, since it is larger than the sum of its proper divisors (51392570).

64240690 is a wasteful number, since it uses less digits than its factorization.

64240690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6424076.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 64240690 is about 8015.0290080573. The cubic root of 64240690 is about 400.5008102111.

The spelling of 64240690 in words is "sixty-four million, two hundred forty thousand, six hundred ninety".