620991154 has 8 divisors (see below), whose sum is σ = 1064556288. Its totient is φ = 266139060.

The previous prime is 620991139. The next prime is 620991157. The reversal of 620991154 is 451199026.

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

It is not an unprimeable number, because it can be changed into a prime (620991157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22178242 + ... + 22178269.

It is an arithmetic number, because the mean of its divisors is an integer number (133069536).

Almost surely, 2^620991154 is an apocalyptic number.

620991154 is a deficient number, since it is larger than the sum of its proper divisors (443565134).

620991154 is a wasteful number, since it uses less digits than its factorization.

620991154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44356520.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 620991154 is about 24919.6940992461. The cubic root of 620991154 is about 853.1560429141.

The spelling of 620991154 in words is "six hundred twenty million, nine hundred ninety-one thousand, one hundred fifty-four".