64257490 has 32 divisors (see below), whose sum is σ = 128329920. Its totient is φ = 22968000.

The previous prime is 64257481. The next prime is 64257491. The reversal of 64257490 is 9475246.

It is a super-2 number, since 2×64257490² = 8258050042200200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64257491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1540 + ... + 11440.

It is an arithmetic number, because the mean of its divisors is an integer number (4010310).

Almost surely, 2^64257490 is an apocalyptic number.

64257490 is a deficient number, since it is larger than the sum of its proper divisors (64072430).

64257490 is a wasteful number, since it uses less digits than its factorization.

64257490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9978.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 64257490 is about 8016.0769706883. The cubic root of 64257490 is about 400.5357196907.

The spelling of 64257490 in words is "sixty-four million, two hundred fifty-seven thousand, four hundred ninety".