64738457 has 6 divisors (see below), whose sum is σ = 75308058. Its totient is φ = 55490064.

The previous prime is 64738441. The next prime is 64738463. The reversal of 64738457 is 75483746.

It can be written as a sum of positive squares in only one way, i.e., 48706441 + 16032016 = 6979^2 + 4004^2 .

It is not a de Polignac number, because 64738457 - 2⁴ = 64738441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64738477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 660548 + ... + 660645.

It is an arithmetic number, because the mean of its divisors is an integer number (12551343).

Almost surely, 2^64738457 is an apocalyptic number.

It is an amenable number.

64738457 is a deficient number, since it is larger than the sum of its proper divisors (10569601).

64738457 is a wasteful number, since it uses less digits than its factorization.

64738457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321207 (or 1321200 counting only the distinct ones).

The product of its digits is 564480, while the sum is 44.

The square root of 64738457 is about 8046.0211906258. The cubic root of 64738457 is about 401.5325726368.

The spelling of 64738457 in words is "sixty-four million, seven hundred thirty-eight thousand, four hundred fifty-seven".