61492867440 has 80 divisors (see below), whose sum is σ = 190652047488. Its totient is φ = 16396019968.

The previous prime is 61492867427. The next prime is 61492867441. The reversal of 61492867440 is 4476829416.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61492867441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3236047 + ... + 3254993.

Almost surely, 2^61492867440 is an apocalyptic number.

61492867440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61492867440 is an abundant number, since it is smaller than the sum of its proper divisors (129159180048).

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

61492867440 is a wasteful number, since it uses less digits than its factorization.

61492867440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32486 (or 32480 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 61492867440 in words is "sixty-one billion, four hundred ninety-two million, eight hundred sixty-seven thousand, four hundred forty".