55557378 has 48 divisors (see below), whose sum is σ = 124933536. Its totient is φ = 17830080.

The previous prime is 55557367. The next prime is 55557389. The reversal of 55557378 is 87375555.

55557378 is a `hidden beast` number, since 5 + 5 + 5 + 573 + 78 = 666.

It is an interprime number because it is at equal distance from previous prime (55557367) and next prime (55557389).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60801 + ... + 61707.

It is an arithmetic number, because the mean of its divisors is an integer number (2602782).

Almost surely, 2^55557378 is an apocalyptic number.

55557378 is an abundant number, since it is smaller than the sum of its proper divisors (69376158).

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

55557378 is a wasteful number, since it uses less digits than its factorization.

55557378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039 (or 1036 counting only the distinct ones).

The product of its digits is 735000, while the sum is 45.

The square root of 55557378 is about 7453.6821772866. The cubic root of 55557378 is about 381.5755864950.

The spelling of 55557378 in words is "fifty-five million, five hundred fifty-seven thousand, three hundred seventy-eight".