61636740 has 96 divisors (see below), whose sum is σ = 192374784. Its totient is φ = 14616960.

The previous prime is 61636739. The next prime is 61636753. The reversal of 61636740 is 4763616.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30027 + ... + 32013.

It is an arithmetic number, because the mean of its divisors is an integer number (2003904).

Almost surely, 2^61636740 is an apocalyptic number.

61636740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61636740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96187392).

61636740 is an abundant number, since it is smaller than the sum of its proper divisors (130738044).

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

61636740 is a wasteful number, since it uses less digits than its factorization.

61636740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2057 (or 2055 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 61636740 is about 7850.9069539767. The cubic root of 61636740 is about 395.0146659085.

The spelling of 61636740 in words is "sixty-one million, six hundred thirty-six thousand, seven hundred forty".