42651810 has 96 divisors (see below), whose sum is σ = 119603952. Its totient is φ = 10506240.

The previous prime is 42651797. The next prime is 42651811. The reversal of 42651810 is 1815624.

42651810 is a `hidden beast` number, since 4 + 2 + 651 + 8 + 1 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 20439441 + 22212369 = 4521^2 + 4713^2 .

It is a super-2 number, since 2×42651810² = 3638353792552200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42651811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93102 + ... + 93558.

Almost surely, 2^42651810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42651810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59801976).

42651810 is an abundant number, since it is smaller than the sum of its proper divisors (76952142).

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

42651810 is a wasteful number, since it uses less digits than its factorization.

42651810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 42651810 is about 6530.8353217640. The cubic root of 42651810 is about 349.3916233931.

The spelling of 42651810 in words is "forty-two million, six hundred fifty-one thousand, eight hundred ten".