61572020 has 12 divisors (see below), whose sum is σ = 129301284. Its totient is φ = 24628800.

The previous prime is 61572019. The next prime is 61572031. The reversal of 61572020 is 2027516.

It can be written as a sum of positive squares in 2 ways, for example, as 45104656 + 16467364 = 6716^2 + 4058^2 .

It is a super-2 number, since 2×61572020² = 7582227293760800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1539281 + ... + 1539320.

It is an arithmetic number, because the mean of its divisors is an integer number (10775107).

Almost surely, 2^61572020 is an apocalyptic number.

It is an amenable number.

61572020 is an abundant number, since it is smaller than the sum of its proper divisors (67729264).

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

61572020 is a wasteful number, since it uses less digits than its factorization.

61572020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078610 (or 3078608 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 61572020 is about 7846.7840546303. The cubic root of 61572020 is about 394.8763593159.

Adding to 61572020 its reverse (2027516), we get a palindrome (63599536).

The spelling of 61572020 in words is "sixty-one million, five hundred seventy-two thousand, twenty".