3642431781 has 16 divisors (see below), whose sum is σ = 5193177408. Its totient is φ = 2262816000.

The previous prime is 3642431743. The next prime is 3642431791. The reversal of 3642431781 is 1871342463.

It is not a de Polignac number, because 3642431781 - 2¹⁴ = 3642415397 is a prime.

It is a super-2 number, since 2×3642431781² = 26534618558477663922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3642431791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348415 + ... + 358716.

It is an arithmetic number, because the mean of its divisors is an integer number (324573588).

Almost surely, 2^3642431781 is an apocalyptic number.

It is an amenable number.

3642431781 is a deficient number, since it is larger than the sum of its proper divisors (1550745627).

3642431781 is a wasteful number, since it uses less digits than its factorization.

3642431781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707252.

The product of its digits is 96768, while the sum is 39.

The square root of 3642431781 is about 60352.5623399703. The cubic root of 3642431781 is about 1538.6168191251.

The spelling of 3642431781 in words is "three billion, six hundred forty-two million, four hundred thirty-one thousand, seven hundred eighty-one".