61445340 has 72 divisors (see below), whose sum is σ = 203334768. Its totient is φ = 14895360.

The previous prime is 61445339. The next prime is 61445353. The reversal of 61445340 is 4354416.

61445340 is a `hidden beast` number, since 614 + 4 + 5 + 3 + 40 = 666.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13537 + ... + 17496.

It is an arithmetic number, because the mean of its divisors is an integer number (2824094).

Almost surely, 2^61445340 is an apocalyptic number.

61445340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61445340 is an abundant number, since it is smaller than the sum of its proper divisors (141889428).

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

61445340 is a wasteful number, since it uses less digits than its factorization.

61445340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31059 (or 31054 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 61445340 is about 7838.7078016724. The cubic root of 61445340 is about 394.6053634822.

Adding to 61445340 its reverse (4354416), we get a palindrome (65799756).

It can be divided in two parts, 614 and 45340, that added together give a palindrome (45954).

The spelling of 61445340 in words is "sixty-one million, four hundred forty-five thousand, three hundred forty".