42820761 has 4 divisors (see below), whose sum is σ = 57094352. Its totient is φ = 28547172.

The previous prime is 42820753. The next prime is 42820777. The reversal of 42820761 is 16702824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 42820761 - 2³ = 42820753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42820711) 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, 7136791 + ... + 7136796.

It is an arithmetic number, because the mean of its divisors is an integer number (14273588).

Almost surely, 2^42820761 is an apocalyptic number.

It is an amenable number.

42820761 is a deficient number, since it is larger than the sum of its proper divisors (14273591).

42820761 is a wasteful number, since it uses less digits than its factorization.

42820761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14273590.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 42820761 is about 6543.7574068726. The cubic root of 42820761 is about 349.8523486047.

The spelling of 42820761 in words is "forty-two million, eight hundred twenty thousand, seven hundred sixty-one".