7555640478 has 32 divisors (see below), whose sum is σ = 15685954560. Its totient is φ = 2423676480.

The previous prime is 7555640471. The next prime is 7555640489. The reversal of 7555640478 is 8740465557.

It is a self number, because there is not a number n which added to its sum of digits gives 7555640478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7555640471) 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, 80175 + ... + 146762.

It is an arithmetic number, because the mean of its divisors is an integer number (490186080).

Almost surely, 2^7555640478 is an apocalyptic number.

7555640478 is an abundant number, since it is smaller than the sum of its proper divisors (8130314082).

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

7555640478 is a wasteful number, since it uses less digits than its factorization.

7555640478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227152.

The product of its (nonzero) digits is 4704000, while the sum is 51.

The square root of 7555640478 is about 86923.1872287251. The cubic root of 7555640478 is about 1962.2624573429.

The spelling of 7555640478 in words is "seven billion, five hundred fifty-five million, six hundred forty thousand, four hundred seventy-eight".