612720155 has 8 divisors (see below), whose sum is σ = 739515312. Its totient is φ = 487342048.

The previous prime is 612720139. The next prime is 612720167. The reversal of 612720155 is 551027216.

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

It is a cyclic number.

It is not a de Polignac number, because 612720155 - 2⁴ = 612720139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353309 + ... + 355038.

It is an arithmetic number, because the mean of its divisors is an integer number (92439414).

Almost surely, 2^612720155 is an apocalyptic number.

612720155 is a deficient number, since it is larger than the sum of its proper divisors (126795157).

612720155 is a wasteful number, since it uses less digits than its factorization.

612720155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708525.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 612720155 is about 24753.1847445940. The cubic root of 612720155 is about 849.3513644366.

The spelling of 612720155 in words is "six hundred twelve million, seven hundred twenty thousand, one hundred fifty-five".