1055478978 has 32 divisors (see below), whose sum is σ = 2346657600. Its totient is φ = 351654048.

The previous prime is 1055478973. The next prime is 1055479043. The reversal of 1055478978 is 8798745501.

1055478978 is a `hidden beast` number, since 1 + 0 + 5 + 547 + 8 + 97 + 8 = 666.

It is a super-2 number, since 2×1055478978² = 2228071745999848968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1055478973) 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, 156153 + ... + 162771.

It is an arithmetic number, because the mean of its divisors is an integer number (73333050).

Almost surely, 2^1055478978 is an apocalyptic number.

1055478978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1055478978 is an abundant number, since it is smaller than the sum of its proper divisors (1291178622).

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

1055478978 is a wasteful number, since it uses less digits than its factorization.

1055478978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9583 (or 9577 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The square root of 1055478978 is about 32488.1359576077. The cubic root of 1055478978 is about 1018.1611679577.

The spelling of 1055478978 in words is "one billion, fifty-five million, four hundred seventy-eight thousand, nine hundred seventy-eight".