861629436 has 36 divisors (see below), whose sum is σ = 2180250072. Its totient is φ = 286914144.

The previous prime is 861629429. The next prime is 861629437. The reversal of 861629436 is 634926168.

861629436 is a `hidden beast` number, since 8 + 616 + 29 + 4 + 3 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 861629391 and 861629400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861629437) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24655 + ... + 48281.

It is an arithmetic number, because the mean of its divisors is an integer number (60562502).

Almost surely, 2^861629436 is an apocalyptic number.

It is an amenable number.

861629436 is an abundant number, since it is smaller than the sum of its proper divisors (1318620636).

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

861629436 is a wasteful number, since it uses less digits than its factorization.

861629436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24650 (or 24645 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 861629436 is about 29353.5251034693. The cubic root of 861629436 is about 951.5687602086.

The spelling of 861629436 in words is "eight hundred sixty-one million, six hundred twenty-nine thousand, four hundred thirty-six".