42526640 has 80 divisors (see below), whose sum is σ = 107784768. Its totient is φ = 15510528.

The previous prime is 42526621. The next prime is 42526651. The reversal of 42526640 is 4662524.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106922 + ... + 107318.

Almost surely, 2^42526640 is an apocalyptic number.

42526640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42526640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53892384).

42526640 is an abundant number, since it is smaller than the sum of its proper divisors (65258128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42526640 is a wasteful number, since it uses less digits than its factorization.

42526640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 42526640 is about 6521.2452798526. The cubic root of 42526640 is about 349.0495026975.

The spelling of 42526640 in words is "forty-two million, five hundred twenty-six thousand, six hundred forty".