2687156640 has 192 divisors, whose sum is σ = 10748747520. Its totient is φ = 614200320.

The previous prime is 2687156603. The next prime is 2687156671. The reversal of 2687156640 is 466517862.

2687156640 is a `hidden beast` number, since 2 + 6 + 87 + 1 + 566 + 4 + 0 = 666.

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

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, 14191 + ... + 74670.

It is an arithmetic number, because the mean of its divisors is an integer number (55983060).

Almost surely, 2^2687156640 is an apocalyptic number.

2687156640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2687156640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5374373760).

2687156640 is an abundant number, since it is smaller than the sum of its proper divisors (8061590880).

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

2687156640 is a wasteful number, since it uses less digits than its factorization.

2687156640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88892 (or 88878 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 2687156640 is about 51837.7916196282. The cubic root of 2687156640 is about 1390.2652289628.

The spelling of 2687156640 in words is "two billion, six hundred eighty-seven million, one hundred fifty-six thousand, six hundred forty".