61572120 has 32 divisors (see below), whose sum is σ = 184716720. Its totient is φ = 16419200.

The previous prime is 61572101. The next prime is 61572143. The reversal of 61572120 is 2127516.

It is a super-2 number, since 2×61572120² = 7582251922588800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256431 + ... + 256670.

Almost surely, 2^61572120 is an apocalyptic number.

61572120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61572120 is an abundant number, since it is smaller than the sum of its proper divisors (123144600).

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

61572120 is a wasteful number, since it uses less digits than its factorization.

61572120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513115 (or 513111 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 61572120 is about 7846.7904266649. The cubic root of 61572120 is about 394.8765730905.

Adding to 61572120 its reverse (2127516), we get a palindrome (63699636).

The spelling of 61572120 in words is "sixty-one million, five hundred seventy-two thousand, one hundred twenty".