61322440 has 32 divisors (see below), whose sum is σ = 138915000. Its totient is φ = 24361984.

The previous prime is 61322423. The next prime is 61322483. The reversal of 61322440 is 4422316.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 49364676 + 11957764 = 7026^2 + 3458^2 .

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, 816 + ... + 11104.

Almost surely, 2^61322440 is an apocalyptic number.

It is an amenable number.

61322440 is an abundant number, since it is smaller than the sum of its proper divisors (77592560).

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

61322440 is a wasteful number, since it uses less digits than its factorization.

61322440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10449 (or 10445 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 61322440 is about 7830.8645755114. The cubic root of 61322440 is about 394.3420976868.

Adding to 61322440 its reverse (4422316), we get a palindrome (65744756).

The spelling of 61322440 in words is "sixty-one million, three hundred twenty-two thousand, four hundred forty".