64190749 has 8 divisors (see below), whose sum is σ = 73581248. Its totient is φ = 54855360.

The previous prime is 64190743. The next prime is 64190779. The reversal of 64190749 is 94709146.

64190749 = T₄₄₁ + T₄₄₂ + ... + T₇₇₇.

It is a happy number.

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

It is not a de Polignac number, because 64190749 - 2¹¹ = 64188701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64190743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11247 + ... + 15964.

It is an arithmetic number, because the mean of its divisors is an integer number (9197656).

Almost surely, 2^64190749 is an apocalyptic number.

It is an amenable number.

64190749 is a deficient number, since it is larger than the sum of its proper divisors (9390499).

64190749 is a wasteful number, since it uses less digits than its factorization.

64190749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27555.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 64190749 is about 8011.9129426124. The cubic root of 64190749 is about 400.3969995979.

The spelling of 64190749 in words is "sixty-four million, one hundred ninety thousand, seven hundred forty-nine".