61504728 has 32 divisors (see below), whose sum is σ = 154034160. Its totient is φ = 20465280.

The previous prime is 61504697. The next prime is 61504733. The reversal of 61504728 is 82740516.

It is a congruent number.

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, 13926 + ... + 17802.

Almost surely, 2^61504728 is an apocalyptic number.

It is an amenable number.

61504728 is an abundant number, since it is smaller than the sum of its proper divisors (92529432).

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

61504728 is a wasteful number, since it uses less digits than its factorization.

61504728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547 (or 4543 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 61504728 is about 7842.4950111556. The cubic root of 61504728 is about 394.7324535503.

It can be divided in two parts, 6150 and 4728, that added together give a triangular number (10878 = T₁₄₇).

The spelling of 61504728 in words is "sixty-one million, five hundred four thousand, seven hundred twenty-eight".