61478540 has 24 divisors (see below), whose sum is σ = 134719200. Its totient is φ = 23522048.

The previous prime is 61478539. The next prime is 61478551. The reversal of 61478540 is 4587416.

It is a super-2 number, since 2×61478540² = 7559221761063200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61478540.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66365 + ... + 67284.

It is an arithmetic number, because the mean of its divisors is an integer number (5613300).

Almost surely, 2^61478540 is an apocalyptic number.

It is an amenable number.

61478540 is an abundant number, since it is smaller than the sum of its proper divisors (73240660).

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

61478540 is a wasteful number, since it uses less digits than its factorization.

61478540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133681 (or 133679 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 61478540 is about 7840.8252116726. The cubic root of 61478540 is about 394.6764214297.

The spelling of 61478540 in words is "sixty-one million, four hundred seventy-eight thousand, five hundred forty".