61999956 has 36 divisors (see below), whose sum is σ = 160060992. Its totient is φ = 20226384.

The previous prime is 61999897. The next prime is 61999967. The reversal of 61999956 is 65999916.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16630 + ... + 20013.

Almost surely, 2^61999956 is an apocalyptic number.

It is an amenable number.

61999956 is an abundant number, since it is smaller than the sum of its proper divisors (98061036).

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

61999956 is a wasteful number, since it uses less digits than its factorization.

61999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36700 (or 36695 counting only the distinct ones).

The product of its digits is 1180980, while the sum is 54.

The square root of 61999956 is about 7874.0050800085. The cubic root of 61999956 is about 395.7890673405.

The spelling of 61999956 in words is "sixty-one million, nine hundred ninety-nine thousand, nine hundred fifty-six".