61297872 has 20 divisors (see below), whose sum is σ = 158352960. Its totient is φ = 20432608.

The previous prime is 61297871. The next prime is 61297877. The reversal of 61297872 is 27879216.

61297872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×61297872² = 7514858223456768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61297871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638472 + ... + 638567.

It is an arithmetic number, because the mean of its divisors is an integer number (7917648).

Almost surely, 2^61297872 is an apocalyptic number.

It is an amenable number.

61297872 is an abundant number, since it is smaller than the sum of its proper divisors (97055088).

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

61297872 is a wasteful number, since it uses less digits than its factorization.

61297872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277050 (or 1277044 counting only the distinct ones).

The product of its digits is 84672, while the sum is 42.

The square root of 61297872 is about 7829.2957537699. The cubic root of 61297872 is about 394.2894280564.

The spelling of 61297872 in words is "sixty-one million, two hundred ninety-seven thousand, eight hundred seventy-two".