61172826 has 64 divisors (see below), whose sum is σ = 145635840. Its totient is φ = 16885440.

The previous prime is 61172821. The next prime is 61172843. The reversal of 61172826 is 62827116.

It is a super-2 number, since 2×61172826² = 7484229281652552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (61172821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70785 + ... + 71643.

It is an arithmetic number, because the mean of its divisors is an integer number (2275560).

Almost surely, 2^61172826 is an apocalyptic number.

61172826 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 61172826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72817920).

61172826 is an abundant number, since it is smaller than the sum of its proper divisors (84463014).

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

61172826 is a wasteful number, since it uses less digits than its factorization.

61172826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971.

The product of its digits is 8064, while the sum is 33.

The square root of 61172826 is about 7821.3059011907. The cubic root of 61172826 is about 394.0211322806.

It can be divided in two parts, 611 and 72826, that added together give a palindrome (73437).

The spelling of 61172826 in words is "sixty-one million, one hundred seventy-two thousand, eight hundred twenty-six".