42767621 has 4 divisors (see below), whose sum is σ = 46057452. Its totient is φ = 39477792.

The previous prime is 42767587. The next prime is 42767623. The reversal of 42767621 is 12676724.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14145121 + 28622500 = 3761^2 + 5350^2 .

It is a cyclic number.

It is not a de Polignac number, because 42767621 - 2²² = 38573317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42767623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1644896 + ... + 1644921.

It is an arithmetic number, because the mean of its divisors is an integer number (11514363).

Almost surely, 2^42767621 is an apocalyptic number.

It is an amenable number.

42767621 is a deficient number, since it is larger than the sum of its proper divisors (3289831).

42767621 is a wasteful number, since it uses less digits than its factorization.

42767621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3289830.

The product of its digits is 28224, while the sum is 35.

The square root of 42767621 is about 6539.6957880317. The cubic root of 42767621 is about 349.7075679801.

The spelling of 42767621 in words is "forty-two million, seven hundred sixty-seven thousand, six hundred twenty-one".