64143557 has 16 divisors (see below), whose sum is σ = 68597760. Its totient is φ = 59875200.

The previous prime is 64143553. The next prime is 64143577. The reversal of 64143557 is 75534146.

It is a cyclic number.

It is not a de Polignac number, because 64143557 - 2² = 64143553 is a prime.

It is a super-2 number, since 2×64143557² = 8228791809224498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64143551) 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, 138308 + ... + 138770.

It is an arithmetic number, because the mean of its divisors is an integer number (4287360).

Almost surely, 2^64143557 is an apocalyptic number.

It is an amenable number.

64143557 is a deficient number, since it is larger than the sum of its proper divisors (4454203).

64143557 is a wasteful number, since it uses less digits than its factorization.

64143557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644.

The product of its digits is 50400, while the sum is 35.

The square root of 64143557 is about 8008.9672867355. The cubic root of 64143557 is about 400.2988537438.

The spelling of 64143557 in words is "sixty-four million, one hundred forty-three thousand, five hundred fifty-seven".