42691280 has 20 divisors (see below), whose sum is σ = 99257412. Its totient is φ = 17076480.

The previous prime is 42691249. The next prime is 42691361. The reversal of 42691280 is 8219624.

It can be written as a sum of positive squares in 2 ways, for example, as 23541904 + 19149376 = 4852^2 + 4376^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266741 + ... + 266900.

Almost surely, 2^42691280 is an apocalyptic number.

42691280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42691280 is an abundant number, since it is smaller than the sum of its proper divisors (56566132).

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

42691280 is a wasteful number, since it uses less digits than its factorization.

42691280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533654 (or 533648 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 42691280 is about 6533.8564416430. The cubic root of 42691280 is about 349.4993658754.

The spelling of 42691280 in words is "forty-two million, six hundred ninety-one thousand, two hundred eighty".