61540506 has 32 divisors (see below), whose sum is σ = 143956800. Its totient is φ = 19433520.

The previous prime is 61540499. The next prime is 61540511. The reversal of 61540506 is 60504516.

It is a happy number.

61540506 is a `hidden beast` number, since 6 + 154 + 0 + 506 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 61540506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28965 + ... + 31016.

It is an arithmetic number, because the mean of its divisors is an integer number (4498650).

Almost surely, 2^61540506 is an apocalyptic number.

61540506 is an abundant number, since it is smaller than the sum of its proper divisors (82416294).

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

61540506 is a wasteful number, since it uses less digits than its factorization.

61540506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60011 (or 60005 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 61540506 is about 7844.7757138111. The cubic root of 61540506 is about 394.8089788333.

The spelling of 61540506 in words is "sixty-one million, five hundred forty thousand, five hundred six".