61529640 has 32 divisors (see below), whose sum is σ = 184589280. Its totient is φ = 16407872.

The previous prime is 61529609. The next prime is 61529641. The reversal of 61529640 is 4692516.

It is not an unprimeable number, because it can be changed into a prime (61529641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256254 + ... + 256493.

It is an arithmetic number, because the mean of its divisors is an integer number (5768415).

Almost surely, 2^61529640 is an apocalyptic number.

61529640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61529640 is an abundant number, since it is smaller than the sum of its proper divisors (123059640).

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

61529640 is a wasteful number, since it uses less digits than its factorization.

61529640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512761 (or 512757 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 61529640 is about 7844.0831204163. The cubic root of 61529640 is about 394.7857407681.

The spelling of 61529640 in words is "sixty-one million, five hundred twenty-nine thousand, six hundred forty".