61377440 has 24 divisors (see below), whose sum is σ = 145004580. Its totient is φ = 24550912.

The previous prime is 61377439. The next prime is 61377443. The reversal of 61377440 is 4477316.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 61277584 + 99856 = 7828^2 + 316^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 61377397 and 61377406.

It is not an unprimeable number, because it can be changed into a prime (61377443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191645 + ... + 191964.

Almost surely, 2^61377440 is an apocalyptic number.

It is an amenable number.

61377440 is an abundant number, since it is smaller than the sum of its proper divisors (83627140).

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

61377440 is a wasteful number, since it uses less digits than its factorization.

61377440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383624 (or 383616 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 61377440 is about 7834.3755335062. The cubic root of 61377440 is about 394.4599573935.

The spelling of 61377440 in words is "sixty-one million, three hundred seventy-seven thousand, four hundred forty".