61234440 has 32 divisors (see below), whose sum is σ = 183703680. Its totient is φ = 16329152.

The previous prime is 61234417. The next prime is 61234463. The reversal of 61234440 is 4443216.

It is an interprime number because it is at equal distance from previous prime (61234417) and next prime (61234463).

It is a super-2 number, since 2×61234440² = 7499313284227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 61234440.

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, 255024 + ... + 255263.

It is an arithmetic number, because the mean of its divisors is an integer number (5740740).

Almost surely, 2^61234440 is an apocalyptic number.

61234440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61234440 is an abundant number, since it is smaller than the sum of its proper divisors (122469240).

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

61234440 is a wasteful number, since it uses less digits than its factorization.

61234440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510301 (or 510297 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 61234440 is about 7825.2437661711. The cubic root of 61234440 is about 394.1533754863.

Adding to 61234440 its reverse (4443216), we get a palindrome (65677656).

The spelling of 61234440 in words is "sixty-one million, two hundred thirty-four thousand, four hundred forty".