61821634 has 32 divisors (see below), whose sum is σ = 108892800. Its totient is φ = 26311824.

The previous prime is 61821623. The next prime is 61821653. The reversal of 61821634 is 43612816.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 61821596 and 61821605.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155524 + ... + 155920.

It is an arithmetic number, because the mean of its divisors is an integer number (3402900).

Almost surely, 2^61821634 is an apocalyptic number.

61821634 is a deficient number, since it is larger than the sum of its proper divisors (47071166).

61821634 is a wasteful number, since it uses less digits than its factorization.

61821634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647 (or 633 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 61821634 is about 7862.6734639053. The cubic root of 61821634 is about 395.4092516359.

The spelling of 61821634 in words is "sixty-one million, eight hundred twenty-one thousand, six hundred thirty-four".