812520642 has 16 divisors (see below), whose sum is σ = 1627401312. Its totient is φ = 270446880.

The previous prime is 812520619. The next prime is 812520649. The reversal of 812520642 is 246025218.

It is a super-3 number, since 3×812520642³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (812520649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93843 + ... + 102134.

It is an arithmetic number, because the mean of its divisors is an integer number (101712582).

Almost surely, 2^812520642 is an apocalyptic number.

812520642 is an abundant number, since it is smaller than the sum of its proper divisors (814880670).

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

812520642 is a wasteful number, since it uses less digits than its factorization.

812520642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196673.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 812520642 is about 28504.7477098114. The cubic root of 812520642 is about 933.1356913420.

The spelling of 812520642 in words is "eight hundred twelve million, five hundred twenty thousand, six hundred forty-two".