61854440 has 16 divisors (see below), whose sum is σ = 139172580. Its totient is φ = 24741760.

The previous prime is 61854431. The next prime is 61854451. The reversal of 61854440 is 4445816.

It can be written as a sum of positive squares in 2 ways, for example, as 61748164 + 106276 = 7858^2 + 326^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61854397 and 61854406.

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, 773141 + ... + 773220.

Almost surely, 2^61854440 is an apocalyptic number.

It is an amenable number.

61854440 is an abundant number, since it is smaller than the sum of its proper divisors (77318140).

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

61854440 is a wasteful number, since it uses less digits than its factorization.

61854440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546372 (or 1546368 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 61854440 is about 7864.7593733057. The cubic root of 61854440 is about 395.4791813203.

The spelling of 61854440 in words is "sixty-one million, eight hundred fifty-four thousand, four hundred forty".