64158749 has 4 divisors (see below), whose sum is σ = 64664064. Its totient is φ = 63653436.

The previous prime is 64158737. The next prime is 64158761. The reversal of 64158749 is 94785146.

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 an interprime number because it is at equal distance from previous prime (64158737) and next prime (64158761).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64158749 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 (64158719) 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, 252467 + ... + 252720.

It is an arithmetic number, because the mean of its divisors is an integer number (16166016).

Almost surely, 2^64158749 is an apocalyptic number.

It is an amenable number.

64158749 is a deficient number, since it is larger than the sum of its proper divisors (505315).

64158749 is a wasteful number, since it uses less digits than its factorization.

64158749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505314.

The product of its digits is 241920, while the sum is 44.

The square root of 64158749 is about 8009.9156674712. The cubic root of 64158749 is about 400.3304540085.

The spelling of 64158749 in words is "sixty-four million, one hundred fifty-eight thousand, seven hundred forty-nine".