61994040 has 32 divisors (see below), whose sum is σ = 185982480. Its totient is φ = 16531712.

The previous prime is 61994033. The next prime is 61994057. The reversal of 61994040 is 4049916.

It is a junction number, because it is equal to n+sod(n) for n = 61993992 and 61994010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258189 + ... + 258428.

Almost surely, 2^61994040 is an apocalyptic number.

61994040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61994040 is an abundant number, since it is smaller than the sum of its proper divisors (123988440).

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

61994040 is a wasteful number, since it uses less digits than its factorization.

61994040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516631 (or 516627 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 61994040 is about 7873.6294045377. The cubic root of 61994040 is about 395.7764782853.

The spelling of 61994040 in words is "sixty-one million, nine hundred ninety-four thousand, forty".