61297530 has 160 divisors (see below), whose sum is σ = 183924864. Its totient is φ = 13039488.

The previous prime is 61297469. The next prime is 61297531. The reversal of 61297530 is 3579216.

It is a junction number, because it is equal to n+sod(n) for n = 61297491 and 61297500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61297531) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1656672 + ... + 1656708.

Almost surely, 2^61297530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61297530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91962432).

61297530 is an abundant number, since it is smaller than the sum of its proper divisors (122627334).

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

61297530 is a wasteful number, since it uses less digits than its factorization.

61297530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 61297530 is about 7829.2739126946. The cubic root of 61297530 is about 394.2886947670.

The spelling of 61297530 in words is "sixty-one million, two hundred ninety-seven thousand, five hundred thirty".