61541440 has 28 divisors (see below), whose sum is σ = 146546316. Its totient is φ = 24616448.

The previous prime is 61541423. The next prime is 61541461. The reversal of 61541440 is 4414516.

It can be written as a sum of positive squares in 2 ways, for example, as 17239104 + 44302336 = 4152^2 + 6656^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95839 + ... + 96478.

It is an arithmetic number, because the mean of its divisors is an integer number (5233797).

Almost surely, 2^61541440 is an apocalyptic number.

It is an amenable number.

61541440 is an abundant number, since it is smaller than the sum of its proper divisors (85004876).

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

61541440 is a wasteful number, since it uses less digits than its factorization.

61541440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192334 (or 192324 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 61541440 is about 7844.8352436492. The cubic root of 61541440 is about 394.8109761613.

Adding to 61541440 its reverse (4414516), we get a palindrome (65955956).

The spelling of 61541440 in words is "sixty-one million, five hundred forty-one thousand, four hundred forty".