61422440 has 32 divisors (see below), whose sum is σ = 145476000. Its totient is φ = 23275584.

The previous prime is 61422391. The next prime is 61422457. The reversal of 61422440 is 4422416.

It is a super-2 number, since 2×61422440² = 7545432271107200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39650 + ... + 41169.

It is an arithmetic number, because the mean of its divisors is an integer number (4546125).

Almost surely, 2^61422440 is an apocalyptic number.

It is an amenable number.

61422440 is an abundant number, since it is smaller than the sum of its proper divisors (84053560).

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

61422440 is a wasteful number, since it uses less digits than its factorization.

61422440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80849 (or 80845 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 61422440 is about 7837.2469656124. The cubic root of 61422440 is about 394.5563357032.

Adding to 61422440 its reverse (4422416), we get a palindrome (65844856).

The spelling of 61422440 in words is "sixty-one million, four hundred twenty-two thousand, four hundred forty".