61981632 has 56 divisors (see below), whose sum is σ = 182219600. Its totient is φ = 20659968.

The previous prime is 61981607. The next prime is 61981637. The reversal of 61981632 is 23618916.

61981632 is a `hidden beast` number, since 6 + 19 + 8 + 1 + 632 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61981637) 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, 16207 + ... + 19662.

Almost surely, 2^61981632 is an apocalyptic number.

It is an amenable number.

61981632 is an abundant number, since it is smaller than the sum of its proper divisors (120237968).

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

61981632 is a wasteful number, since it uses less digits than its factorization.

61981632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35890 (or 35874 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 61981632 is about 7872.8414184461. The cubic root of 61981632 is about 395.7500718640.

The spelling of 61981632 in words is "sixty-one million, nine hundred eighty-one thousand, six hundred thirty-two".