42721770 has 64 divisors (see below), whose sum is σ = 126201600. Its totient is φ = 9013248.

The previous prime is 42721769. The next prime is 42721771. The reversal of 42721770 is 7712724.

It is an interprime number because it is at equal distance from previous prime (42721769) and next prime (42721771).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (42721771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5095 + ... + 10554.

It is an arithmetic number, because the mean of its divisors is an integer number (1971900).

Almost surely, 2^42721770 is an apocalyptic number.

42721770 is an abundant number, since it is smaller than the sum of its proper divisors (83479830).

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

42721770 is a wasteful number, since it uses less digits than its factorization.

42721770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15679.

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 42721770 is about 6536.1892567459. The cubic root of 42721770 is about 349.5825499182.

The spelling of 42721770 in words is "forty-two million, seven hundred twenty-one thousand, seven hundred seventy".