61761040 has 40 divisors (see below), whose sum is σ = 156650688. Its totient is φ = 22458240.

The previous prime is 61761031. The next prime is 61761041. The reversal of 61761040 is 4016716.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 61760996 and 61761014.

It is not an unprimeable number, because it can be changed into a prime (61761041) 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, 34212 + ... + 35971.

Almost surely, 2^61761040 is an apocalyptic number.

It is an amenable number.

61761040 is an abundant number, since it is smaller than the sum of its proper divisors (94889648).

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

61761040 is a wasteful number, since it uses less digits than its factorization.

61761040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70207 (or 70201 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 61761040 is about 7858.8192497347. The cubic root of 61761040 is about 395.2800236252.

Adding to 61761040 its reverse (4016716), we get a palindrome (65777756).

The spelling of 61761040 in words is "sixty-one million, seven hundred sixty-one thousand, forty".