61645038 has 72 divisors (see below), whose sum is σ = 155677032. Its totient is φ = 16130016.

The previous prime is 61645033. The next prime is 61645061. The reversal of 61645038 is 83054616.

It is a super-2 number, since 2×61645038² = 7600221420042888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61645033) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 485331 + ... + 485457.

It is an arithmetic number, because the mean of its divisors is an integer number (2162181).

Almost surely, 2^61645038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61645038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77838516).

61645038 is an abundant number, since it is smaller than the sum of its proper divisors (94031994).

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

61645038 is a wasteful number, since it uses less digits than its factorization.

61645038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 61645038 is about 7851.4354101655. The cubic root of 61645038 is about 395.0323917249.

It can be divided in two parts, 616 and 45038, that added together give a palindrome (45654).

The spelling of 61645038 in words is "sixty-one million, six hundred forty-five thousand, thirty-eight".