55152778 has 8 divisors (see below), whose sum is σ = 83162880. Its totient is φ = 27431820.

The previous prime is 55152739. The next prime is 55152793. The reversal of 55152778 is 87725155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×55152778² = 6083657842234568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55152778.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71808 + ... + 72571.

It is an arithmetic number, because the mean of its divisors is an integer number (10395360).

Almost surely, 2^55152778 is an apocalyptic number.

55152778 is a deficient number, since it is larger than the sum of its proper divisors (28010102).

55152778 is a wasteful number, since it uses less digits than its factorization.

55152778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144572.

The product of its digits is 98000, while the sum is 40.

The square root of 55152778 is about 7426.4916346819. The cubic root of 55152778 is about 380.6470462756.

The spelling of 55152778 in words is "fifty-five million, one hundred fifty-two thousand, seven hundred seventy-eight".