61396440 has 64 divisors (see below), whose sum is σ = 210504960. Its totient is φ = 14033280.

The previous prime is 61396427. The next prime is 61396459. The reversal of 61396440 is 4469316.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35706 + ... + 37385.

It is an arithmetic number, because the mean of its divisors is an integer number (3289140).

Almost surely, 2^61396440 is an apocalyptic number.

61396440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61396440 is an abundant number, since it is smaller than the sum of its proper divisors (149108520).

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

61396440 is a wasteful number, since it uses less digits than its factorization.

61396440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73112 (or 73108 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 61396440 is about 7835.5880443015. The cubic root of 61396440 is about 394.5006562017.

The spelling of 61396440 in words is "sixty-one million, three hundred ninety-six thousand, four hundred forty".