61617138 has 32 divisors (see below), whose sum is σ = 140285952. Its totient is φ = 17859600.

The previous prime is 61617131. The next prime is 61617169. The reversal of 61617138 is 83171616.

It is a super-2 number, since 2×61617138² = 7593343390622088, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 61617099 and 61617108.

It is not an unprimeable number, because it can be changed into a prime (61617131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18778 + ... + 21813.

It is an arithmetic number, because the mean of its divisors is an integer number (4383936).

Almost surely, 2^61617138 is an apocalyptic number.

61617138 is an abundant number, since it is smaller than the sum of its proper divisors (78668814).

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

61617138 is a wasteful number, since it uses less digits than its factorization.

61617138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40630.

The product of its digits is 6048, while the sum is 33.

The square root of 61617138 is about 7849.6584639078. The cubic root of 61617138 is about 394.9727866740.

The spelling of 61617138 in words is "sixty-one million, six hundred seventeen thousand, one hundred thirty-eight".