64501949 has 12 divisors (see below), whose sum is σ = 66909780. Its totient is φ = 62156160.

The previous prime is 64501939. The next prime is 64501973. The reversal of 64501949 is 94910546.

It can be written as a sum of positive squares in 6 ways, for example, as 4439449 + 60062500 = 2107^2 + 7750^2 .

It is not a de Polignac number, because 64501949 - 2¹⁶ = 64436413 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 (64501939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 591707 + ... + 591815.

It is an arithmetic number, because the mean of its divisors is an integer number (5575815).

Almost surely, 2^64501949 is an apocalyptic number.

It is an amenable number.

64501949 is a deficient number, since it is larger than the sum of its proper divisors (2407831).

64501949 is an equidigital number, since it uses as much as digits as its factorization.

64501949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 64501949 is about 8031.3105406278. The cubic root of 64501949 is about 401.0430050706.

The spelling of 64501949 in words is "sixty-four million, five hundred one thousand, nine hundred forty-nine".