820635742 has 8 divisors (see below), whose sum is σ = 1231972056. Its totient is φ = 409978392.

The previous prime is 820635737. The next prime is 820635799. The reversal of 820635742 is 247536028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166708 + ... + 171559.

It is an arithmetic number, because the mean of its divisors is an integer number (153996507).

Almost surely, 2^820635742 is an apocalyptic number.

820635742 is a deficient number, since it is larger than the sum of its proper divisors (411336314).

820635742 is a wasteful number, since it uses less digits than its factorization.

820635742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339482.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 820635742 is about 28646.7405126657. The cubic root of 820635742 is about 936.2319893648.

The spelling of 820635742 in words is "eight hundred twenty million, six hundred thirty-five thousand, seven hundred forty-two".