61273257840 has 160 divisors (see below), whose sum is σ = 218330222400. Its totient is φ = 15776087040.

The previous prime is 61273257779. The next prime is 61273257863. The reversal of 61273257840 is 4875237216.

61273257840 is a `hidden beast` number, since 6 + 1 + 2 + 7 + 32 + 578 + 40 = 666.

61273257840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 426451 + ... + 551730.

It is an arithmetic number, because the mean of its divisors is an integer number (1364563890).

Almost surely, 2^61273257840 is an apocalyptic number.

61273257840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61273257840 is an abundant number, since it is smaller than the sum of its proper divisors (157056964560).

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

61273257840 is a wasteful number, since it uses less digits than its factorization.

61273257840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978232 (or 978220 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 61273257840 in words is "sixty-one billion, two hundred seventy-three million, two hundred fifty-seven thousand, eight hundred forty".