61815252 has 24 divisors (see below), whose sum is σ = 147591136. Its totient is φ = 20125728.

The previous prime is 61815239. The next prime is 61815253. The reversal of 61815252 is 25251816.

It is a super-2 number, since 2×61815252² = 7642250759647008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61815253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59383 + ... + 60414.

Almost surely, 2^61815252 is an apocalyptic number.

It is an amenable number.

61815252 is an abundant number, since it is smaller than the sum of its proper divisors (85775884).

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

61815252 is a wasteful number, since it uses less digits than its factorization.

61815252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119847 (or 119845 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 61815252 is about 7862.2676118280. The cubic root of 61815252 is about 395.3956448097.

The spelling of 61815252 in words is "sixty-one million, eight hundred fifteen thousand, two hundred fifty-two".