77420061900 has 144 divisors (see below), whose sum is σ = 261990870400. Its totient is φ = 19558739520.

The previous prime is 77420061821. The next prime is 77420061907. The reversal of 77420061900 is 916002477.

It is a happy number.

It is a super-2 number, since 2×77420061900² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (77420061907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 703282 + ... + 805881.

Almost surely, 2^77420061900 is an apocalyptic number.

It is an amenable number.

77420061900 is an abundant number, since it is smaller than the sum of its proper divisors (184570808500).

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

77420061900 is a wasteful number, since it uses less digits than its factorization.

77420061900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509205 (or 1509192 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The spelling of 77420061900 in words is "seventy-seven billion, four hundred twenty million, sixty-one thousand, nine hundred".