64557406 has 4 divisors (see below), whose sum is σ = 96836112. Its totient is φ = 32278702.

The previous prime is 64557401. The next prime is 64557419. The reversal of 64557406 is 60475546.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60475546 = 2 ⋅30237773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64557401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16139350 + ... + 16139353.

It is an arithmetic number, because the mean of its divisors is an integer number (24209028).

Almost surely, 2^64557406 is an apocalyptic number.

64557406 is a deficient number, since it is larger than the sum of its proper divisors (32278706).

64557406 is a wasteful number, since it uses less digits than its factorization.

64557406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32278705.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 64557406 is about 8034.7623486946. The cubic root of 64557406 is about 401.1579073919.

It can be divided in two parts, 6455 and 7406, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 64557406 in words is "sixty-four million, five hundred fifty-seven thousand, four hundred six".