61540472 has 48 divisors (see below), whose sum is σ = 137887560. Its totient is φ = 25655616.

The previous prime is 61540469. The next prime is 61540489. The reversal of 61540472 is 27404516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12383 + ... + 16625.

Almost surely, 2^61540472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61540472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68943780).

61540472 is an abundant number, since it is smaller than the sum of its proper divisors (76347088).

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

61540472 is a wasteful number, since it uses less digits than its factorization.

61540472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4300 (or 4289 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 61540472 is about 7844.7735467635. The cubic root of 61540472 is about 394.8089061251.

Adding to 61540472 its reverse (27404516), we get a palindrome (88944988).

The spelling of 61540472 in words is "sixty-one million, five hundred forty thousand, four hundred seventy-two".